diff --git a/MarketDataLib/Numerics/Numerics.cs b/MarketDataLib/Numerics/Numerics.cs
index d88f907..0cc23c2 100644
--- a/MarketDataLib/Numerics/Numerics.cs
+++ b/MarketDataLib/Numerics/Numerics.cs
@@ -65,7 +65,8 @@ namespace MarketData.Numerical
       double stddev=StdDev(ref observations);
       deviations=Math.Abs(deviations);
       if(deviations<1)deviations=1;
-      double[] newObservations=(from double value in observations where value<deviations*stddev && value>-2*stddev select value).ToArray<double>();
+//      double[] newObservations=(from double value in observations where value<deviations*stddev && value>-2*stddev select value).ToArray<double>();
+      double[] newObservations=(from double value in observations where value<deviations*stddev && value > (deviations*-1)*stddev select value).ToArray<double>();
       return newObservations;
     }
     public static LeastSquaresResult LeastSquares(double[] observations)