Fixed R-squared example

nethi · Mar 17, 2012 · 40d6a18 · 40d6a18
1 parent 460d1d6
commit 40d6a18
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/05-Regression/chapter05.R b/05-Regression/chapter05.R
@@ -157,10 +157,12 @@ rmse
 #[1] 7.266361
 
 # Sixteenth snippet
-mean.rmse <- 1.09209343
-model.rmse <- 0.954544
+# There was an error in the book for this example.
+# R-squared is a ratio of MSE's, not RMSE's.
+mean.mse <- 1.09209343
+model.mse <- 0.954544
 
-r2 <- 1 - (model.rmse / mean.rmse)
+r2 <- 1 - (model.mse / mean.mse)
 r2
 #[1] 0.1259502