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Ce document utilise Manuel du site Web PHP chinois Libérer
(PECL trader >= 0.2.0)
trader_stddev — Standard Deviation
$real
[, integer $timePeriod
[, float $nbDev
]] )
real
浮点数数组。
timePeriod
Number of period. Valid range from 2 to 100000.
nbDev
Returns an array with calculated data or false on failure.