Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing briefly about the stats_rand_gen_ibinomial_negative() function.
The stats_rand_gen_ibinomial_negative() function generates random deviate from the negative binomial distribution.
The stats_rand_gen_ibinomial_negative() function generates random deviate from the negative binomial distribution.
Syntax
Following below is the syntax to use this function -
int stats_rand_gen_ibinomial_negative( int $n, float $p )
Parameter Details
Sr.No | Parameter | Description |
---|---|---|
1 | n | The number of success |
2 | p | The success rate |
Return Value
It returns a random deviate from negative binomial distribution where the number of success and the success rate is "n" and "p" respectively.
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 compute the random deviation from the given negative binomial distribution where the number of success is 2, and the success rate is 0.5 -
<?php var_dump(is_int(stats_rand_ibinomial_negative(2, 0.5))); ?>
Output
When the above code is executed, it will produce the following result -
bool(true)
Example2
Following example below is an error case. In the below example, we have passed n < 0. A warning is shown in logs -
<?php // error cases var_dump(stats_rand_ibinomial_negative(-1, 0.5)); // n < 0 ?>
Output
The above code will produce the following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): n < 0. n: -1
bool(false)
Example3
Following example below is an error case. In the below example, we have passed pp < 0. A warning is shown in logs -
<?php // error cases var_dump(stats_rand_ibinomial_negative(1, -0.1)); // pp < 0 ?>
Output
The above code will produce the following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): p is out of range. p: -1E-1
bool(false)
Example4
Following example below is an error case. In the following example, we have passed pp > 1. A warning is shown in logs -
<?php // error cases var_dump(stats_rand_ibinomial_negative(1, 1.1)); // pp > 1 ?>
Output
The above code will produce the following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): p is out of range. p: 1E+0.
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_rand_gen_int() Function.
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Thanks for reading and bye for now.