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# 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 )`

## Parameter Details

Sr.NoParameterDescription
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)`

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.

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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Thanks for reading and bye for now.