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.
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.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)
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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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.