stats_cdf_f

(PECL stats >= 1.0.0)

stats_cdf_f — Calculates any one parameter of the F distribution given values for the others

说明

stats_cdf_f(
    float $par1,
    float $par2,
    float $par3,
    int $which
): float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the F distribution. The kind of the return value and parameters (par1, par2, and par3) are determined by which.

The following table lists the return value and parameters by which. CDF, x, d1, and d2 denotes cumulative distribution function, the value of the random variable, and the degree of freedoms of the F distribution, respectively.

**Return value and parameters**
`which`	Return value	`par1`	`par2`	`par3`
1	CDF	x	d1	d2
2	x	CDF	d1	d2
3	d1	x	CDF	d2
4	d2	x	CDF	d1

参数

par1: The first parameter
par2: The second parameter
par3: The third parameter
which: The flag to determine what to be calculated

返回值

Returns CDF, x, d1, or d2, determined by which.

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User Contributed Notes 1 note

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brjann (theat) gmail (thedot) com ¶

17 years ago


Input  and return values of stats_cdf_t depends on the $which-parameter:
<?php
function get_t_p($t, $df){
   return stats_cdf_t($t, $df, 1);
}

function get_t_t($p, $df){
   return stats_cdf_t($p, $df, 2);
}

function get_t_df($p, $t){
   return stats_cdf_t($p, $t, 3);
}
?>

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