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.