Changeset 218 for trunk/src/Averager.h

Timestamp:

Dec 30, 2004, 11:29:15 PM (18 years ago)

Author:

Peter

Message:

sum_xsqr_centered(void) added

File:

• trunk/src/Averager.h (modified) (2 diffs)

trunk/src/Averager.h

@@ -93 +93 @@
 
     ///
+    /// @return \f$ \sum_i (x_i-m)^2\f$
+    ///
+    inline double sum_xsqr_centered(void) const { return xx_-x_*x_/n_; }
+
+    ///
     /// The variance is calculated using the \f$ (n-1) \f$ correction,
     /// which means it is the best unbiased estimator of the variance
@@ -101 +106 @@
     ///
     inline double variance(void) const 
-    { return (n_>1) ? (xx_-x_*x_/n_)/(n_-1) : 0; }
+    { return (n_>1) ? sum_xsqr_centered()/(n_-1) : 0; }
 
     ///