Changeset 220

Timestamp:

Dec 30, 2004, 11:31:34 PM (18 years ago)

Author:

Peter

Message:

fixed bug in standard error function

File:

• trunk/src/WeightedAverager.h (modified) (1 diff)

trunk/src/WeightedAverager.h

@@ -68 +68 @@
 
     ///
-    /// The variance is calculated as \f$ \frac{\sum w_i^2}{(\sum
+    /// The standard deviation is calculated as \f$ \frac{\sum w_i^2}{(\sum
     /// w_i)^2-\sum w_i^2}\frac{\sum w_i(x_i-m)^2}{\sum w_i} \f$
-    /// @return squared error
     ///
-    /// @return variance of mean
+    /// @return standard deviation of mean
     ///
     inline double standard_error(void)  const 
-    { return (squared_sum()/((sum_w()*sum_w())-squared_sum())
+    { return sqrt(squared_sum()/((sum_w()*sum_w())-squared_sum())
               *squared_error()/sum_w()); }