Regression Analysis, R Squared, Pseudo R Squared, Adjusted R Squared, Deviance.
In the worst case, RSS=TSS and R² = 0. For Ordinary Least Squares Linear Regression Models, R² ranges from 0 to 1 Applicability of R² to Nonlinear Regression models Many non-linear regression models do not use the Ordinary Least Squares Estimation technique to fit the model. Examples of such