trader_stddev

(PECL trader >= 0.2.0)

trader_stddev — Standard Deviation

說明

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

參數(shù)

real

浮點(diǎn)數(shù)數(shù)組。

timePeriod

Number of period. Valid range from 2 to 100000.

nbDev

返回值

Returns an array with calculated data or false on failure.