Fitted line plots By Jim Frost Fitted line plots display the fitted values for all predictor values in your observation space. Use these plots to assess model fit by comparing how well the fitted values follow the observed values. Related Related Articles: Curve Fitting using Linear and Nonlinear RegressionChoosing the Correct Type of Regression AnalysisUnderstanding Historiansâ€™ Rankings of U.S. Presidents using Regression ModelsScatterplots: Using, Examples, and InterpretingLinear Regression Equation Explained