// 计算标准差函数

 Numeric CalcStdDev(Series<Numeric> price, Numeric period=14)

 Params

  Series<Numeric> price

  Numeric period(14)

 Vars

  Numeric mean

  Numeric meanSq

 Begin

  If (CurrentBar < period - 1)

  {

   Return 0;

  }

  mean = AverageFC(price, period);

  meanSq = AverageFC(price * price, period);

  Return Sqrt(meanSq - mean * mean);

 End

 //ATR计算函数

 Numeric CalcATR(Numeric period)

 Params

  Numeric period

 Vars

 Begin

  If (CurrentBar < period - 1)

  {

   Return 0;

  }

  Return AverageFC(TrueRange(), period);

 End