PHP Statistics Library

PHP Statistics Library contains following statistical functions

Sum

The sum of all observations of sample from population or the sum of all elements of population

Mean (μ)

The average of all observations of sample or population which tells the common behaviour of the group.

Mode

The most repeated value of the obervations in a sample or population

Median

The central element of the group after arranging the observations in either ascending or descending order. For even numbers the median is the average of two middle numbers.

Sample Standard Deviation (s)

Standard Deviation is an inferencial statistics function to estimate how the common characteristics of data deviates from mean or the common behavior of the sample data.

Population Standard Deviation (σ)

It is an descrptive statistics function to find how the common characteristics of data deviates from the the mean or common behavior of the population data.

Sample Variance (s²)

An inferential statistics function describes the variablitiy among the sample data. It tells how uniformly the data in the sample set distributed across.

Population Variance (σ²)

An inferential statistics function describes the variablitiy among the population data. It tells how uniformly the data in the population distributed across.

Standard Error of Mean and Proportion (SE)

Standard Error is an popular inferential statistics function used to estimate how effective the selected sample size influence the results of statistical experiments.

Factorial (n!)

A popular mathematical function used in the context of probability & statistics to find the possible outcomes for a sample space.

Permutations (nPr)

A probability function which describes how many permutations (nPr) are possible in a sample space where the the order is very important (for example XY & YX are not same and are considered two different events)

Combinations (nCr or n Choose k)

A probability function which describes how many combinations (nCr or n Choose k) are possible in a sample space where the the order is not important (for example XY & YX are same events and are considered as a single event)

Z-score to P-value

Z-score is the measure of deviation of dataset in a sample or population which describes how many standard deviation the complete set of sample or population data deviates from its mean. P-value is the measure of probability which estimates the data distribution in the expected region of bell curve.

How to use

Place the phpstats.php file in your project folder, import the class and create object for the class to use it.

require('phpstats.php');
$stats = new PhpStats();
$arr = array(10,20,10,30,40,50,60,70);
$mode = $stats->mode($arr);

Open-Source License

phpstatistics is subject to the terms of the MIT LICENSE.