stats_standard_deviation

    (PECL stats >= 1.0.0)

    stats_standard_deviation — Returns the standard deviation

    说明

    stats_standard_deviation(array $a, bool $sample = false): float

    Returns the standard deviation of the values in a.

    参数

    a

    The array of data to find the standard deviation for. Note that all values of the array will be cast to float.

    sample

    Indicates if a represents a sample of the population; defaults to false.

    返回值

    Returns the standard deviation on success; false on failure.

    错误／异常

    Raises an E_WARNING when there are fewer than 2 values in a.

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