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

説明

float stats_cdf_t(float $par1, float $par2, int $which)

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

The following table lists the return value and parameters by which. CDF, x, and nu denotes cumulative distribution function, the value of the random variable, and the degrees of freedom of the t-distribution, respectively.

**Return value and parameters**
`which`	Return value	`par1`	`par2`
1	CDF	x	nu
2	x	CDF	nu
3	nu	x	CDF

パラメータ

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

戻り値

Returns CDF, x, or nu, determined by which.