As of Version 7.0, RSquared has become a property of LinearModelFit.
- To use RSquared, you first need to load the Regression Common Functions Package. You can do this by using Needs["LinearRegression`"], which will automatically load the Regression Common Functions Package, or you can load the package directly by using Needs["RegressionCommon`"].
- RSquared is the ratio of the model sum of squares to the total sum of squares.
- RSquared gives the fraction of the variation of the response that is predicted by the model.