stats_cdf_t

    (PECL stats >= 1.0.0)

    stats_cdf_t — Calculates any one parameter of the t-distribution given values for the others

    Descrição

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

    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

    Parâmetros

    par1

    The first parameter

    par2

    The second parameter

    which

    The flag to determine what to be calculated

    Valor Retornado

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

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    Notas Enviadas por Usuários (em inglês) 2 notes

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    3
    Brian
    14 years ago
    In order to match the output of this function with Excel's TDIST function, you must take 1 - the value. For example, for a two-tailed T-distribution for x=4 and degrees of freedom=2, the formula would be:

    (1 - stats_cdf_t(4, 2, 1)) * 2

    For a single tail, do not include the multiply by 2 portion.
    up
    -4
    Anonymous
    13 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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