PHP | stats_stat_correlation() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP stats_stat_correlation() function.

The stats_stat_correlation() function returns back the Pearson Correlation Coefficient of two data sets.

Syntax

Following below is the syntax to use this function -

float stats_stat_correlation( array $arr1, array $arr2 )

READ: PHP | stats_stat_binomial_coef() Function

Parameter Details

Sr.No	Parameter	Description
1	arr1	The first array
2	arr2	The second array

Return Value

This function return the Pearson correlation coefficient between arr1 and arr2, else false on failure.

Dependencies

This built-in function was first introduced in statistics extension (PHP version 4.0.0 and PEAR v1.4.0). In this tutorial guide, we used the latest release of stats-2.0.3 (PHP v7.0.0 or newer and PEAR version 1.4.0 or newer).

Example1

The below example computes the Pearson correlation coefficient of two data sets -

<?php
   var_dump(stats_stat_correlation(array(1, 2, 3), array(1, 2, 3)));
?>

Output

When the above code is executed, it will produce the following result -

float(1)

Example2

The below example computes the Pearson correlation coefficient of two data sets -

<?php
   var_dump(stats_stat_correlation(array(1, 2, 3), array(1, 2, 1)));
?>

Output

When the above code is executed, it will produce the following result -

float(0)

Example3

Following is an error case. In the following example below, we have passed two arrays with unequal length. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_stat_correlation(array(1, 2, 3), array(1, 2, 3, 4)));
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_stat_correlation():Unequal number of X and Y coordinates

bool(false)

READ: PHP | stats_skew() Function

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the stats_stat_factorial() Function.

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