diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/README.md b/lib/node_modules/@stdlib/stats/incr/nankurtosis/README.md
new file mode 100644
index 000000000000..6c5a1a45d8c7
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/README.md
@@ -0,0 +1,217 @@
+
+
+# incrnankurtosis
+
+> Compute a [corrected sample excess kurtosis][sample-excess-kurtosis] incrementally, ignoring `NaN` values.
+
+
+
+The [kurtosis][sample-excess-kurtosis] for a random variable `X` is defined as
+
+
+
+```math
+\mathop{\mathrm{Kurtosis}}[X] = \mathrm{E}\biggl[ \biggl( \frac{X - \mu}{\sigma} \biggr)^4 \biggr]
+```
+
+
+
+
+
+Using a univariate normal distribution as the standard of comparison, the [excess kurtosis][sample-excess-kurtosis] is the kurtosis minus `3`.
+
+For a sample of `n` values, the [sample excess kurtosis][sample-excess-kurtosis] is
+
+
+
+```math
+g_2 = \frac{m_4}{m_2^2} - 3 = \frac{\frac{1}{n} \displaystyle\sum_{i=0}^{n-1} (x_i - \bar{x})^4}{\biggl(\frac{1}{n} \displaystyle\sum_{i=0}^{n-1} (x_i - \bar{x})^2\biggr)^2}
+```
+
+
+
+
+
+where `m_4` is the sample fourth central moment and `m_2` is the sample second central moment.
+
+The previous equation is, however, a biased estimator of the population excess kurtosis. An alternative estimator which is unbiased under normality is
+
+
+
+```math
+G_2 = \frac{(n+1)n}{(n-1)(n-2)(n-3)} \frac{\displaystyle\sum_{i=0}^{n-1} (x_i - \bar{x})^4}{\biggl(\displaystyle\sum_{i=0}^{n-1} (x_i - \bar{x})^2\biggr)^2} - 3 \frac{(n-1)^2}{(n-2)(n-3)}
+```
+
+
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var incrnankurtosis = require( '@stdlib/stats/incr/nankurtosis' );
+```
+
+#### incrnankurtosis()
+
+Returns an accumulator function which incrementally computes a [corrected sample excess kurtosis][sample-excess-kurtosis], ignoring `NaN` values.
+
+```javascript
+var accumulator = incrnankurtosis();
+```
+
+#### accumulator( \[x] )
+
+If provided an input value `x`, the accumulator function returns an updated [corrected sample excess kurtosis][sample-excess-kurtosis]. If not provided an input value `x`, the accumulator function returns the current [corrected sample excess kurtosis][sample-excess-kurtosis].
+
+```javascript
+var accumulator = incrnankurtosis();
+
+var kurtosis = accumulator( 2.0 );
+// returns null
+
+kurtosis = accumulator( 2.0 );
+// returns null
+
+kurtosis = accumulator( -4.0 );
+// returns null
+
+kurtosis = accumulator( -4.0 );
+// returns -6.0
+
+kurtosis = accumulator( NaN );
+// returns -6.0
+```
+
+
+
+
+
+
+
+## Notes
+
+- Input values are type checked. If non-numaric input are possible, you are advised to type check and handle accordingly **before** passing the value to the accumulator function.
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var randu = require( '@stdlib/random/base/randu' );
+var incrnankurtosis = require( '@stdlib/stats/incr/nankurtosis' );
+
+var accumulator;
+var kurtosis;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrnankurtosis();
+
+// For each simulated datum, update the corrected sample excess kurtosis...
+for ( i = 0; i < 100; i++ ) {
+ v = (randu() < 0.2 ) ? NaN : randu() * 100.0; // 20% chance of NaN
+ kurtosis = accumulator( v );
+}
+console.log( accumulator() );
+```
+
+
+
+
+
+* * *
+
+
+
+## References
+
+- Joanes, D. N., and C. A. Gill. 1998. "Comparing measures of sample skewness and kurtosis." _Journal of the Royal Statistical Society: Series D (The Statistician)_ 47 (1). Blackwell Publishers Ltd: 183–89. doi:[10.1111/1467-9884.00122][@joanes:1998].
+
+
+
+
+
+
+
+
+
+* * *
+
+## See Also
+
+- [`@stdlib/stats/incr/mean`][@stdlib/stats/incr/mean]: compute an arithmetic mean incrementally.
+- [`@stdlib/stats/incr/skewness`][@stdlib/stats/incr/skewness]: compute a corrected sample skewness incrementally.
+- [`@stdlib/stats/incr/stdev`][@stdlib/stats/incr/stdev]: compute a corrected sample standard deviation incrementally.
+- [`@stdlib/stats/incr/summary`][@stdlib/stats/incr/summary]: compute a statistical summary incrementally.
+- [`@stdlib/stats/incr/variance`][@stdlib/stats/incr/variance]: compute an unbiased sample variance incrementally.
+
+
+
+
+
+
+
+
+
+[sample-excess-kurtosis]: https://en.wikipedia.org/wiki/Kurtosis
+
+[@joanes:1998]: http://onlinelibrary.wiley.com/doi/10.1111/1467-9884.00122/
+
+
+
+[@stdlib/stats/incr/mean]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/mean
+
+[@stdlib/stats/incr/skewness]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/skewness
+
+[@stdlib/stats/incr/stdev]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/stdev
+
+[@stdlib/stats/incr/summary]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/summary
+
+[@stdlib/stats/incr/variance]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/incr/variance
+
+
+
+
+
+
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/benchmark/benchmark.js b/lib/node_modules/@stdlib/stats/incr/nankurtosis/benchmark/benchmark.js
new file mode 100644
index 000000000000..67e1871b203f
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/benchmark/benchmark.js
@@ -0,0 +1,68 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var pkg = require( './../package.json' ).name;
+var incrnankurtosis = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+ var f;
+ var i;
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ f = incrnankurtosis();
+ if ( typeof f !== 'function' ) {
+ b.fail( 'should return a function' );
+ }
+ }
+ b.toc();
+ if ( typeof f !== 'function' ) {
+ b.fail( 'should return a function' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
+
+bench( pkg+'::accumulator', function benchmark( b ) {
+ var acc;
+ var v;
+ var i;
+
+ acc = incrnankurtosis();
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ v = acc( i );
+ if ( v !== v ) {
+ b.fail( 'should not return NaN' );
+ }
+ }
+ b.toc();
+ if ( v !== v ) {
+ b.fail( 'should not return NaN' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_corrected_sample_excess_kurtosis.svg b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_corrected_sample_excess_kurtosis.svg
new file mode 100644
index 000000000000..60f0e10c944d
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_corrected_sample_excess_kurtosis.svg
@@ -0,0 +1,153 @@
+
\ No newline at end of file
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_kurtosis.svg b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_kurtosis.svg
new file mode 100644
index 000000000000..49e80f11cb5b
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_kurtosis.svg
@@ -0,0 +1,60 @@
+
\ No newline at end of file
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_sample_excess_kurtosis.svg b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_sample_excess_kurtosis.svg
new file mode 100644
index 000000000000..e9c08dadc077
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/img/equation_sample_excess_kurtosis.svg
@@ -0,0 +1,125 @@
+
\ No newline at end of file
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/repl.txt b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/repl.txt
new file mode 100644
index 000000000000..bb4ec23ea2ef
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/repl.txt
@@ -0,0 +1,28 @@
+
+{{alias}}()
+ Returns an accumulator function which incrementally computes a corrected
+ sample excess kurtosis, ignoring `NaN` values.
+
+ If provided a value, the accumulator function returns an updated corrected
+ sample excess kurtosis. If not provided a value, the accumulator function
+ returns the current corrected sample excess kurtosis.
+
+ Returns
+ -------
+ acc: Function
+ Accumulator function.
+
+ Examples
+ --------
+ > var accumulator = {{alias}}();
+ > var v = accumulator( 2.0 )
+ null
+ > v = accumulator( 2.0 )
+ null
+ > v = accumulator( -4.0 )
+ null
+ > v = accumulator( -4.0 )
+ -6.0
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/index.d.ts b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/index.d.ts
new file mode 100644
index 000000000000..5e3481a476e3
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/index.d.ts
@@ -0,0 +1,62 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+///
+
+/**
+* If provided a value, returns an updated corrected sample excess kurtosis; otherwise, returns the current corrected sample excess kurtosis, ignoring `NaN` values.
+*
+* @param x - value
+* @returns corrected sample excess kurtosis
+*/
+type accumulator = ( x?: number ) => number | null;
+
+/**
+* Returns an accumulator function which incrementally computes a corrected sample excess kurtosis.
+*
+* @returns accumulator function
+*
+* @example
+* var accumulator = incrnankurtosis();
+*
+* var kurtosis = accumulator();
+* // returns null
+*
+* kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns -6.0
+*
+* kurtosis = accumulator( NaN );
+* // returns -6.0
+*/
+declare function incrnankurtosis(): accumulator;
+
+
+// EXPORTS //
+
+export = incrnankurtosis;
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/test.ts b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/test.ts
new file mode 100644
index 000000000000..1684d3ede818
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/docs/types/test.ts
@@ -0,0 +1,61 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import incrnankurtosis = require( './index' );
+
+
+// TESTS //
+
+// The function returns an accumulator function...
+{
+ incrnankurtosis(); // $ExpectType accumulator
+}
+
+// The compiler throws an error if the function is provided arguments...
+{
+ incrnankurtosis( '5' ); // $ExpectError
+ incrnankurtosis( 5 ); // $ExpectError
+ incrnankurtosis( true ); // $ExpectError
+ incrnankurtosis( false ); // $ExpectError
+ incrnankurtosis( null ); // $ExpectError
+ incrnankurtosis( undefined ); // $ExpectError
+ incrnankurtosis( [] ); // $ExpectError
+ incrnankurtosis( {} ); // $ExpectError
+ incrnankurtosis( ( x: number ): number => x ); // $ExpectError
+}
+
+// The function returns an accumulator function which returns an accumulated result...
+{
+ const acc = incrnankurtosis();
+
+ acc(); // $ExpectType number | null
+ acc( 3.14 ); // $ExpectType number | null
+}
+
+// The compiler throws an error if the returned accumulator function is provided invalid arguments...
+{
+ const acc = incrnankurtosis();
+
+ acc( '5' ); // $ExpectError
+ acc( true ); // $ExpectError
+ acc( false ); // $ExpectError
+ acc( null ); // $ExpectError
+ acc( [] ); // $ExpectError
+ acc( {} ); // $ExpectError
+ acc( ( x: number ): number => x ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/examples/index.js b/lib/node_modules/@stdlib/stats/incr/nankurtosis/examples/index.js
new file mode 100644
index 000000000000..6a649667e717
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/examples/index.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var randu = require( '@stdlib/random/base/randu' );
+var incrkurtosis = require( './../lib' );
+
+var accumulator;
+var kurtosis;
+var v;
+var i;
+
+// Initialize an accumulator:
+accumulator = incrkurtosis();
+
+// For each simulated datum, update the corrected sample excess kurtosis...
+console.log( '\nValue\tKurtosis\n' );
+for ( i = 0; i < 100; i++ ) {
+ v = ( randu() < 0.2 ) ? NaN : randu() * 100.0; // 20% chance of `NaN`
+ kurtosis = accumulator( v );
+ if ( i < 3 ) {
+ console.log( '%d\t%s', v.toFixed( 4 ), kurtosis );
+ } else {
+ console.log( '%d\t%d', v.toFixed( 4 ), ( kurtosis === null ) ? kurtosis : kurtosis.toFixed( 4 ) );
+ }
+}
+console.log( '\nFinal excess kurtosis: %d\n', accumulator() );
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/index.js b/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/index.js
new file mode 100644
index 000000000000..b84bd211dc96
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/index.js
@@ -0,0 +1,54 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Compute a corrected sample excess kurtosis incrementally, ignoring `NaN` values.
+*
+* @module @stdlib/stats/incr/nankurtosis
+*
+* @example
+* var incrnankurtosis = require( '@stdlib/stats/incr/nankurtosis' );
+*
+* var accumulator = incrnankurtosis();
+*
+* var kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns -6.0
+*
+* kurtosis = accumulator( NaN );
+* // returns -6.0
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/main.js b/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/main.js
new file mode 100644
index 000000000000..799b79066367
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/lib/main.js
@@ -0,0 +1,87 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var incrkurtosis = require( '@stdlib/stats/incr/kurtosis/lib' );
+
+
+// MAIN //
+
+/**
+* Returns an accumulator function which incrementally computes a corrected sample excess kurtosis, ignoring `NaN` values.
+*
+* ## Method
+*
+* The algorithm computes the sample excess kurtosis using the formula for `G_2` in [Joanes and Gill 1998][@joanes:1998]. In contrast to alternatives for calculating a sample kurtosis, `G_2` is an unbiased estimator under normality.
+*
+* ## References
+*
+* - Joanes, D. N., and C. A. Gill. 1998. "Comparing measures of sample skewness and kurtosis." _Journal of the Royal Statistical Society: Series D (The Statistician)_ 47 (1). Blackwell Publishers Ltd: 183–89. doi:[10.1111/1467-9884.00122][@joanes:1998].
+*
+* [@joanes:1998]: http://dx.doi.org/10.1111/1467-9884.00122
+*
+* @returns {Function} accumulator function
+*
+* @example
+* var accumulator = incrkurtosis();
+*
+* var kurtosis = accumulator();
+* // returns null
+*
+* kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( 2.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns null
+*
+* kurtosis = accumulator( -4.0 );
+* // returns -6.0
+*
+* kurtosis = accumulator( NaN );
+* // returns -6.0
+*/
+function incrnankurtosis() {
+ var kurtosis = incrkurtosis();
+ return accumulator;
+
+ /**
+ * If provided a value, the accumulator function returns an updated corrected sample excess kurtosis. If not provided a value, the accumulator function returns the current corrected sample excess kurtosis.
+ *
+ * @private
+ * @param {number} [x] - new value
+ * @returns {(number|null)} corrected sample excess kurtosis
+ */
+ function accumulator( x ) {
+ if ( arguments.length === 0 || isnan( x ) ) {
+ return kurtosis();
+ }
+ return kurtosis( x );
+ }
+}
+
+
+// EXPORTS //
+
+module.exports = incrnankurtosis;
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/package.json b/lib/node_modules/@stdlib/stats/incr/nankurtosis/package.json
new file mode 100644
index 000000000000..3aa1157edde1
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/package.json
@@ -0,0 +1,66 @@
+{
+ "name": "@stdlib/stats/incr/nankurtosis",
+ "version": "0.0.0",
+ "description": "Compute a corrected sample excess kurtosis incrementally, ignoring NaN values.",
+ "license": "Apache-2.0",
+ "author": {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ },
+ "contributors": [
+ {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ }
+ ],
+ "main": "./lib",
+ "directories": {
+ "benchmark": "./benchmark",
+ "doc": "./docs",
+ "example": "./examples",
+ "lib": "./lib",
+ "test": "./test"
+ },
+ "types": "./docs/types",
+ "scripts": {},
+ "homepage": "https://github.com/stdlib-js/stdlib",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/stdlib-js/stdlib.git"
+ },
+ "bugs": {
+ "url": "https://github.com/stdlib-js/stdlib/issues"
+ },
+ "dependencies": {},
+ "devDependencies": {},
+ "engines": {
+ "node": ">=0.10.0",
+ "npm": ">2.7.0"
+ },
+ "os": [
+ "aix",
+ "darwin",
+ "freebsd",
+ "linux",
+ "macos",
+ "openbsd",
+ "sunos",
+ "win32",
+ "windows"
+ ],
+ "keywords": [
+ "stdlib",
+ "stdmath",
+ "statistics",
+ "stats",
+ "mathematics",
+ "math",
+ "kurtosis",
+ "sample kurtosis",
+ "shape",
+ "kurt",
+ "corrected",
+ "incremental",
+ "accumulator"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/stats/incr/nankurtosis/test/test.js b/lib/node_modules/@stdlib/stats/incr/nankurtosis/test/test.js
new file mode 100644
index 000000000000..47b17775a456
--- /dev/null
+++ b/lib/node_modules/@stdlib/stats/incr/nankurtosis/test/test.js
@@ -0,0 +1,118 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var abs = require( '@stdlib/math/base/special/abs' );
+var EPS = require( '@stdlib/constants/float64/eps' );
+var incrnankurtosis = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof incrnankurtosis, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function returns an accumulator function', function test( t ) {
+ t.equal( typeof incrnankurtosis(), 'function', 'returns a function' );
+ t.end();
+});
+
+tape( 'the accumulator function incrementally computes a corrected sample excess kurtosis', function test( t ) {
+ var expected;
+ var actual;
+ var delta;
+ var data;
+ var tol;
+ var acc;
+ var i;
+
+ data = [ 2.0, NaN, 2.0, -4.0, -4.0, 1.5, NaN, -10 ];
+
+ // Check against the kurtosis function of the `e1071` R package:
+ expected = [
+ null,
+ null,
+ null,
+ null,
+ -6,
+ -3.309339678762642,
+ -3.309339678762642,
+ -0.1906596382525679
+ ];
+
+ acc = incrnankurtosis();
+
+ for ( i = 0; i < data.length; i++ ) {
+ actual = acc( data[ i ] );
+ if ( expected[i] === null ) {
+ t.equal( actual, null, 'returns null' );
+ } else {
+ delta = abs( actual - expected[ i ] );
+ tol = 1.5 * EPS * abs( expected[ i ] );
+ t.ok( delta <= tol, 'within tolerance. actual: '+actual+'. E: '+expected[i]+' Δ: '+delta+'. tol: '+tol );
+ }
+ }
+
+ t.end();
+});
+
+tape( 'if not provided an input value, the accumulator function returns the current corrected sample excess kurtosis', function test( t ) {
+ var data;
+ var acc;
+ var i;
+
+ data = [ -10.0, NaN, -10.0, 10.0, NaN, 10.0 ];
+ acc = incrnankurtosis();
+ for ( i = 0; i < data.length; i++ ) {
+ acc( data[ i ] );
+ }
+
+ t.equal( acc(), -6.0, 'returns the current accumulated corrected sample excess kurtosis' );
+ t.end();
+});
+
+tape( 'the corrected sample excess kurtosis is `null` until at least 4 datums have been provided', function test( t ) {
+ var acc;
+ var out;
+
+ acc = incrnankurtosis();
+
+ out = acc();
+ t.equal( out, null, 'returns null' );
+
+ out = acc( 2.0 );
+ t.equal( out, null, 'returns null' );
+
+ out = acc( 8.0 );
+ t.equal( out, null, 'returns null' );
+
+ out = acc( -4.0 );
+ t.equal( out, null, 'returns null' );
+
+ out = acc( 3.0 );
+ t.notEqual( out, null, 'does not return null' );
+
+ t.end();
+});