stats_dens_pmf_hypergeometric
(PECL stats >= 1.0.0)
stats_dens_pmf_hypergeometric — Probability mass function of the hypergeometric distribution
説明
Returns the probability mass at n1
, where the random variable
follows the hypergeometric distribution of which the number of failure is
n2
, the number of success samples is N1
,
and the number of failure samples is N2
.
パラメータ
n1
-
The number of success, at which the probability mass is calculated
n2
-
The number of failure of the distribution
N1
-
The number of success samples of the distribution
N2
-
The number of failure samples of the distribution
戻り値
The probability mass at n1
or false
for failure.
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User Contributed Notes 1 note
brendan at gamblingtec dot com ¶
5 years ago
You can use this method to work out lottery odds:
/**
* N is the population size OR total balls in the lottery draw
* K is the number of success states in the population OR the number of correct balls drawn from the pool
* n is the number of draws OR the number of times we draw from the pool to get the winning numbers.
*/
$N = 49; //Total balls in the pool
$K = 1; //Successful matches to win
$method = new Hypergeometric($N, $K, $K);
$odds = $method->pmf($K);
return 1/$odds;
//Will return 49
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