PHP | stats_stat_correlation() Function

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 )


Parameter Details

Sr.NoParameterDescription
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)


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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