Php/docs/function.trader-stddev
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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.
