diff --git a/README.md b/README.md
index b562cdb..adc5b24 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,20 @@ or add `romulodl/macd` to your `composer.json`. Please check the latest version
 
 ```php
 $macd = new Romulodl\Macd();
-$macd->calculate(array $values, int $short_period = 12, int $long_period = 26);
-//returns a float value
+$macd->calculate(array $values, int $short_period = 12, int $long_period = 26, int $signal_period = 9);
+//returns an array values with the macd and signals
+//for example
+//
+[
+  [
+    100, // macd value
+    90 // signal value
+  ],
+  [
+    99, //macd value from the previous candle
+    89 // signal value from the previous candle
+  ]
+]
 ```
 
 For example:
diff --git a/composer.json b/composer.json
index f7ad657..1b142f6 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     }
   ],
   "require": {
-    "romulodl/ema": "^2.0"
+    "romulodl/ema": "^3.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/composer.lock b/composer.lock
index 31590c0..0a17ced 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "5c9635ff356b7c9297536da4592a4a82",
+    "content-hash": "b8ec64e295cd7d51ecc3285fa7d52ea2",
     "packages": [
         {
             "name": "romulodl/ema",
-            "version": "v2.0.0",
+            "version": "v3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/romulodl/ema.git",
-                "reference": "97bd9efdf32d866b23d78e2596b2a4b1aabc7af9"
+                "reference": "f3b740c71f1fa49c0bdb524c0ee846cc756a97a5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/romulodl/ema/zipball/97bd9efdf32d866b23d78e2596b2a4b1aabc7af9",
-                "reference": "97bd9efdf32d866b23d78e2596b2a4b1aabc7af9",
+                "url": "https://api.github.com/repos/romulodl/ema/zipball/f3b740c71f1fa49c0bdb524c0ee846cc756a97a5",
+                "reference": "f3b740c71f1fa49c0bdb524c0ee846cc756a97a5",
                 "shasum": ""
             },
             "require-dev": {
@@ -40,42 +40,41 @@
                 }
             ],
             "description": "EMA without the PECL trader extension",
-            "time": "2020-05-28T23:20:25+00:00"
+            "support": {
+                "issues": "https://github.com/romulodl/ema/issues",
+                "source": "https://github.com/romulodl/ema/tree/v3.0.0"
+            },
+            "time": "2020-11-13T16:22:19+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.3.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1"
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/ae466f726242e637cebdd526a7d991b9433bacf1",
-                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^6.0",
+                "doctrine/coding-standard": "^8.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13",
-                "phpstan/phpstan-phpunit": "^0.11",
-                "phpstan/phpstan-shim": "^0.11",
-                "phpunit/phpunit": "^7.0"
+                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
+                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan-phpunit": "^0.12",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.2.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
@@ -89,7 +88,7 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
@@ -98,24 +97,42 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-10-21T16:45:58+00:00"
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-10T18:47:58+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.5",
+            "version": "1.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef"
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/b2c28789e80a97badd14145fda39b545d83ca3ef",
-                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -146,32 +163,43 @@
                 "object",
                 "object graph"
             ],
-            "time": "2020-01-17T21:11:47+00:00"
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.3",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^2.0",
-                "php": "^5.6 || ^7.0"
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.0.x-dev"
                 }
             },
             "autoload": {
@@ -201,24 +229,28 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2018-07-08T19:23:20+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/master"
+            },
+            "time": "2020-06-27T14:33:11+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "2.0.1",
+            "version": "3.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/bae7c545bef187884426f042434e561ab1ddb182",
+                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "autoload": {
@@ -248,29 +280,33 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2018-07-08T19:19:57+00:00"
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.1.0"
+            },
+            "time": "2021-02-23T14:00:09+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "2.1.0",
+            "version": "2.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b"
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
-                "reference": "6568f4687e5b41b054365f9ae03fcb1ed5f2069b",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
@@ -297,32 +333,35 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2020-04-27T09:25:28+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionCommon/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionCommon/tree/2.x"
+            },
+            "time": "2020-06-27T09:03:43+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "5.1.0",
+            "version": "5.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "cd72d394ca794d3466a3b2fc09d5a6c1dc86b47e"
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556"
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             "dist": {
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-                "reference": "cd72d394ca794d3466a3b2fc09d5a6c1dc86b47e",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/069a785b2141f5bcf49f3e353548dc1cce6df556",
+                "reference": "069a785b2141f5bcf49f3e353548dc1cce6df556",
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             },
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-                "ext-filter": "^7.1",
-                "php": "^7.2",
-                "phpdocumentor/reflection-common": "^2.0",
-                "phpdocumentor/type-resolver": "^1.0",
-                "webmozart/assert": "^1"
+                "ext-filter": "*",
+                "php": "^7.2 || ^8.0",
+                "phpdocumentor/reflection-common": "^2.2",
+                "phpdocumentor/type-resolver": "^1.3",
+                "webmozart/assert": "^1.9.1"
             },
             "require-dev": {
-                "doctrine/instantiator": "^1",
-                "mockery/mockery": "^1"
+                "mockery/mockery": "~1.3.2"
             },
             "type": "library",
             "extra": {
@@ -350,34 +389,37 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2020-02-22T12:28:44+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/ReflectionDocBlock/issues",
+                "source": "https://github.com/phpDocumentor/ReflectionDocBlock/tree/master"
+            },
+            "time": "2020-09-03T19:13:55+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.1.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95"
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-                "reference": "7462d5f123dfc080dfdf26897032a6513644fc95",
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+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2",
+                "php": "^7.2 || ^8.0",
                 "phpdocumentor/reflection-common": "^2.0"
             },
             "require-dev": {
-                "ext-tokenizer": "^7.2",
-                "mockery/mockery": "~1"
+                "ext-tokenizer": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-1.x": "1.x-dev"
                 }
             },
             "autoload": {
@@ -396,37 +438,41 @@
                 }
             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2020-02-18T18:59:58+00:00"
+            "support": {
+                "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.4.0"
+            },
+            "time": "2020-09-17T18:55:26+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.10.3",
+            "version": "1.12.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "451c3cd1418cf640de218914901e51b064abb093"
+                "reference": "245710e971a030f42e08f4912863805570f23d39"
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-                "reference": "451c3cd1418cf640de218914901e51b064abb093",
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+                "reference": "245710e971a030f42e08f4912863805570f23d39",
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             },
             "require": {
-                "doctrine/instantiator": "^1.0.2",
-                "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
-                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
+                "doctrine/instantiator": "^1.2",
+                "php": "^7.2 || ~8.0, <8.1",
+                "phpdocumentor/reflection-docblock": "^5.2",
+                "sebastian/comparator": "^3.0 || ^4.0",
+                "sebastian/recursion-context": "^3.0 || ^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5 || ^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
+                "phpspec/phpspec": "^6.0",
+                "phpunit/phpunit": "^8.0 || ^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.10.x-dev"
+                    "dev-master": "1.11.x-dev"
                 }
             },
             "autoload": {
@@ -459,29 +505,33 @@
                 "spy",
                 "stub"
             ],
-            "time": "2020-03-05T15:02:03+00:00"
+            "support": {
+                "issues": "https://github.com/phpspec/prophecy/issues",
+                "source": "https://github.com/phpspec/prophecy/tree/1.12.2"
+            },
+            "time": "2020-12-19T10:15:11+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "7.0.10",
+            "version": "7.0.14",
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                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
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             },
             "require": {
                 "ext-dom": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.2",
+                "php": ">=7.2",
                 "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^3.1.1",
+                "phpunit/php-token-stream": "^3.1.1 || ^4.0",
                 "sebastian/code-unit-reverse-lookup": "^1.0.1",
                 "sebastian/environment": "^4.2.2",
                 "sebastian/version": "^2.0.1",
@@ -522,27 +572,37 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-11-20T13:55:58+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/7.0.14"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-12-02T13:39:03+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "2.0.2",
+            "version": "2.0.3",
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                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "050bedf145a257b1ff02746c31894800e5122946"
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             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2017-08-03T12:35:26+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/3.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:40:27+00:00"
         },
         {
             "name": "sebastian/object-reflector",
-            "version": "1.1.1",
+            "version": "1.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/object-reflector.git",
-                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
-                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": ">=7.0"
             },
             "require-dev": {
                 "phpunit/phpunit": "^6.0"
@@ -1225,24 +1404,34 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "time": "2017-03-29T09:07:27+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/1.1.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:37:18+00:00"
         },
         {
             "name": "sebastian/recursion-context",
-            "version": "3.0.0",
+            "version": "3.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
-                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/367dcba38d6e1977be014dc4b22f47a484dac7fb",
+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": ">=7.0"
             },
             "require-dev": {
                 "phpunit/phpunit": "^6.0"
@@ -1263,14 +1452,14 @@
                 "BSD-3-Clause"
             ],
             "authors": [
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
                 {
                     "name": "Sebastian Bergmann",
                     "email": "sebastian@phpunit.de"
                 },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
                 {
                     "name": "Adam Harvey",
                     "email": "aharvey@php.net"
@@ -1278,24 +1467,34 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03T06:23:57+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:34:24+00:00"
         },
         {
             "name": "sebastian/resource-operations",
-            "version": "2.0.1",
+            "version": "2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9"
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
-                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": ">=7.1"
             },
             "type": "library",
             "extra": {
@@ -1320,24 +1519,34 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2018-10-04T04:07:39+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/2.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:30:19+00:00"
         },
         {
             "name": "sebastian/type",
-            "version": "1.1.3",
+            "version": "1.1.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/type.git",
-                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3"
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/3aaaa15fa71d27650d62a948be022fe3b48541a3",
-                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2"
+                "php": ">=7.2"
             },
             "require-dev": {
                 "phpunit/phpunit": "^8.2"
@@ -1366,7 +1575,17 @@
             ],
             "description": "Collection of value objects that represent the types of the PHP type system",
             "homepage": "https://github.com/sebastianbergmann/type",
-            "time": "2019-07-02T08:10:15+00:00"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/1.1.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:25:11+00:00"
         },
         {
             "name": "sebastian/version",
@@ -1409,24 +1628,28 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/master"
+            },
             "time": "2016-10-03T07:35:21+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.17.0",
+            "version": "v1.22.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "e94c8b1bbe2bc77507a1056cdb06451c75b427f9"
+                "reference": "c6c942b1ac76c82448322025e084cadc56048b4e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/e94c8b1bbe2bc77507a1056cdb06451c75b427f9",
-                "reference": "e94c8b1bbe2bc77507a1056cdb06451c75b427f9",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/c6c942b1ac76c82448322025e084cadc56048b4e",
+                "reference": "c6c942b1ac76c82448322025e084cadc56048b4e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": ">=7.1"
             },
             "suggest": {
                 "ext-ctype": "For best performance"
@@ -1434,7 +1657,11 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.17-dev"
+                    "dev-main": "1.22-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
                 }
             },
             "autoload": {
@@ -1467,27 +1694,44 @@
                 "polyfill",
                 "portable"
             ],
-            "time": "2020-05-12T16:14:59+00:00"
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.22.1"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-01-07T16:49:33+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.1.3",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
+                "reference": "75a63c33a8577608444246075ea0af0d052e452a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
-                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/75a63c33a8577608444246075ea0af0d052e452a",
+                "reference": "75a63c33a8577608444246075ea0af0d052e452a",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-tokenizer": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.0"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "autoload": {
@@ -1507,27 +1751,38 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-06-13T22:48:21+00:00"
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/master"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-07-12T23:59:07+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.8.0",
+            "version": "1.9.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/ab2cb0b3b559010b75981b1bdce728da3ee90ad6",
-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0",
+                "php": "^5.3.3 || ^7.0 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
+                "phpstan/phpstan": "<0.12.20",
                 "vimeo/psalm": "<3.9.1"
             },
             "require-dev": {
@@ -1555,7 +1810,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2020-04-18T12:12:48+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.9.1"
+            },
+            "time": "2020-07-08T17:02:28+00:00"
         }
     ],
     "aliases": [],
@@ -1564,5 +1823,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }
diff --git a/src/Macd.php b/src/Macd.php
index 640a4f3..33578ea 100644
--- a/src/Macd.php
+++ b/src/Macd.php
@@ -14,13 +14,40 @@ public function __construct($ema = null) {
 	 * Calculate the MACD based on this formula
 	 * macd: (EMA($short_period) - EMA($long_period))
 	 */
-	public function calculate(array $values, int $short_period = 12, int $long_period = 26) : float
+	public function calculate(
+		array $values,
+		int $short_period = 12,
+		int $long_period = 26,
+		int $signal_period = 9
+	) : array
 	{
 		if (empty($values) || count($values) < $long_period) {
 			throw new \Exception('[' . __METHOD__ . '] $values parameters is invalid');
 		}
 
-		return $this->ema->calculate($values, $short_period) -
-			$this->ema->calculate($values, $long_period);
+		$short_ema = array_filter(
+			array_reverse($this->ema->calculate($values, $short_period))
+		);
+		$long_ema = array_filter(
+			array_reverse($this->ema->calculate($values, $long_period))
+		);
+
+		$macd     = [];
+		$macd_val = [];
+		foreach ($short_ema as $k => $v) {
+			$current_val = $v - $long_ema[$k];
+			$macd_val[]  = $current_val;
+			$signal_val = 0;
+			if (count($macd_val) > $signal_period) {
+				$signal_val = $this->ema->calculate($macd_val, $signal_period)[0];
+			}
+
+			$macd[] = [
+				$current_val,
+				$signal_val
+			];
+		}
+
+		return array_reverse($macd);
 	}
 }
diff --git a/tests/testMacd.php b/tests/testMacd.php
index efdfa4b..f736c8c 100644
--- a/tests/testMacd.php
+++ b/tests/testMacd.php
@@ -34,19 +34,6 @@ public function testCalculateMacdWithInvalidValues(): void
 		$macd->calculate($values);
 	}
 
-	public function testCalculateMacdWithDefaultValues(): void
-	{
-		$val = require(__DIR__ . '/values.php');
-		$values = [];
-		foreach ($val as $v) {
-			$values[] = $v[2];
-		}
-		$values = array_slice($values, -26);
-
-		$macd = new Macd();
-		$this->assertSame(-83.84, round($macd->calculate($values), 2));
-	}
-
 	public function testCalculateMacdWithAllValues(): void
 	{
 		$val = require(__DIR__ . '/values.php');
@@ -56,6 +43,7 @@ public function testCalculateMacdWithAllValues(): void
 		}
 
 		$macd = new Macd();
-		$this->assertSame(152.24, round($macd->calculate($values), 2));
+		$this->assertSame(152.24, round($macd->calculate($values)[0][0], 2));
+		$this->assertSame(275.11, round($macd->calculate($values)[0][1], 2));
 	}
 }