public int stdDevLookback( int optInTimePeriod,
      double optInNbDev )
   {
      if( (int)optInTimePeriod == ( Integer.MIN_VALUE ) )
         optInTimePeriod = 5;
      else if( ((int)optInTimePeriod < 2) || ((int)optInTimePeriod > 100000) )
         return -1;
      if( optInNbDev == (-4e+37) )
         optInNbDev = 1.000000e+0;
      else if( (optInNbDev < -3.000000e+37) || (optInNbDev > 3.000000e+37) )
         return -1;
      return varianceLookback ( optInTimePeriod, optInNbDev );
   }