trader_stddev

    (PECL trader >= 0.2.0)

    trader_stddev — Standard Deviation

    说明

    trader_stddev(array $real, int $timePeriod = ?, float $nbDev = ?): array

    参数

    real

    浮点数数组。

    timePeriod

    Number of period. Valid range from 2 to 100000.

    nbDev

    返回值

    Returns an array with calculated data or false on failure.

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