PHP | stats_stat_paired_t() 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_paired_t() function.

The stats_stat_paired_t() function is used to return the t-value of the dependent t-test for paired samples.

Syntax

Following below is the syntax to use this function -

float stats_stat_paired_t( array $arr1, array $arr2 )

READ: PHP | stats_stat_correlation() Function

Parameter Details

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

Return Value

This built-in function returns the t-value of the dependent t-test for the paired samples arr1 and arr2, or 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

In the following example, we have compute the t-value of the dependent t-test for paired samples arr1 and arr2 -

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

Output

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

float(1)

Example2

In the following example, we have compute the t-value of the dependent t-test for paired samples arr1 and arr2 -

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

Output

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

float(0)

Example3

In the following example, we have compute the t-value of the dependent t-test for paired samples arr1 and arr2 -

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

Output

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

float(-1)

Example4

The following is an error case. In the below example, we passed unequal array lengths. A warning is shown in logs -

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

Output

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

bool(false)

Example5

The following is an error case. In the below example, we have passed arrays with single elements. A warning is shown in logs -

<?php
   // error cases
   var_dump(stats_stat_paired_t(array(1), array(2)));
?>

Output

The above code will produce the following result and a warning in logs PHP Warning: stats_stat_paired_t(): arr1 should have at least 2 elements

bool(false)

READ: PHP | stats_stat_innerproduct() Function

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

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Thanks for reading and bye for now.