PHP マニュアル: Calculates any one parameter of the beta distribution given values for the others

説明

float stats_cdf_beta(
    float $par1,
    float $par2,
    float $par3,
    int $which
)

Returns the cumulative distribution function, its inverse, or one of its parameters, of the beta 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, alpha, and beta denotes cumulative distribution function, the value of the random variable, and shape parameters of the beta distribution, respectively.

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

パラメータ

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

戻り値

Returns CDF, x, alpha, or beta, determined by which.