1. Copyright © 2003, N. Ahbel Residuals

2. Copyright © 2003, N. Ahbel Predicted Actual Actual – Predicted = Error Source: http://www.studyworksonline.com, 8/13/03 “Residual” in statistics is the same as “error” Residual = Actual y – Predicted y

3. Copyright © 2003, N. Ahbel Positive residual Source: http://www.studyworksonline.com, 8/13/03 “Residual” in statistics is the same as “error” Residual = Actual y – Predicted y

4. Copyright © 2003, N. Ahbel Negative residual Source: http://www.studyworksonline.com, 8/13/03 “Residual” in statistics is the same as “error” Residual = Actual y – Predicted y

5. Copyright © 2003, N. Ahbel Residual plot

6. Copyright © 2003, N. Ahbel 1-1 correspondence between every point on the scatterplot and the corresponding point on the residual plot

7. Copyright © 2003, N. Ahbel Clear PatternNo Pattern Residuals  Inappropriate Model  Appropriate Model Concave up or down Increasing or decreasing Too high or low

8. Copyright © 2003, N. Ahbel Pattern – Clear concave down pattern Conclusion - Not an appropriate model

9. Copyright © 2003, N. Ahbel Pattern – No clear pattern Conclusion - Appropriate

10. Copyright © 2003, N. Ahbel Pattern – No clear pattern Conclusion - appropriate model

11. Copyright © 2003, N. Ahbel Residuals