Standard Deviation

# trader_stddev

(PECL trader >= 0.2.0)

trader_stddev — Standard Deviation

### 说明

function 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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