Assessing & Comparing Model Fit

Interpret R-squared and the Residual Standard Error (RSE) to assess the fit of a single regression model.

Explain the purpose of Adjusted R-squared and use it to compare multiple regression models with different numbers of predictors.

Justify model preference by comparing the Adjusted R-squared and RSE of competing models.

Articulate the common exam trap of adding variables to a model solely to increase R-squared.