PHP 8.4.0 RC4 available for testing

    stats_cdf_noncentral_chisquare

    (PECL stats >= 1.0.0)

    stats_cdf_noncentral_chisquare — Calculates any one parameter of the non-central chi-square distribution given values for the others

    说明

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

    Returns the cumulative distribution function, its inverse, or one of its parameters, of the non-central chi-square 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, k, and lambda denotes cumulative distribution function, the value of the random variable, the degree of freedom and the non-centrality parameter of the distribution, respectively.

    Return value and parameters
    which Return value par1 par2 par3
    1 CDF x k lambda
    2 x CDF k lambda
    3 k x CDF lambda
    4 lambda x CDF k

    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, k, or lambda, determined by which.

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