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PHP - Stats Rand Gen Ibinomial Negative() Function
Definition and Usage
The stats_rand_gen_ibinomial_negative() function can generate random deviate from the negative binomial distribution.
Syntax
int stats_rand_gen_ibinomial_negative( int $n, float $p )
Parameters
Sr.No | Parameter | Description |
---|---|---|
1 | n |
The number of success |
2 | p |
The success rate |
Return Values
The stats_rand_gen_ibinomial_negative() function can return a random deviate from the negative binomial distribution where the number of success is n, and the success rate is p.
Dependencies
This function was first introduced in statistics extension (PHP 4.0.0 and PEAR 1.4.0). We have used latest release of stats-2.0.3 (PHP 7.0.0 or newer and PEAR 1.4.0 or newer) for this tutorial
Example
In the following example, we compute random deviate from the 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
This will produce following result −
bool(true)
Example
Following is an error case. In the following example, we pass n < 0. A warning is displayed in logs.
<?php // error cases var_dump(stats_rand_ibinomial_negative(-1, 0.5)); // n < 0 ?>
Output
This will produce following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): n < 0. n : -1
bool(false)
Example
Following is an error case. In the following example, we pass pp < 0. A warning is displayed in logs.
<?php // error cases var_dump(stats_rand_ibinomial_negative(1, -0.1)); // pp < 0 ?>
Output
This will produce following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): p is out of range. p : -1E-1
bool(false)
Example
Following is an error case. In the following example, we pass pp > 1. A warning is displayed in logs.
<?php // error cases var_dump(stats_rand_ibinomial_negative(1, 1.1)); // pp > 1 ?>
Output
This will produce following result and a warning in logs PHP Warning: stats_rand_ibinomial_negative(): p is out of range. p : 1E+0
bool(false)
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