stats_cdf_t

    (PECL stats >= 1.0.0)

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

    Опис

    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

    Параметри

    par1

    The first parameter

    par2

    The second parameter

    which

    The flag to determine what to be calculated

    Значення, що повертаються

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

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    User Contributed Notes 2 notes

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    1
    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)) * 2For 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 $which-parameter:<?phpfunction get_t_p($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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