1. Residuals

2. Actual – Predicted = Error Predicted
“Residual” in statistics is the same as “error” Residual = Actual y – Predicted y
Source: 8/13/03
Actual
Actual – Predicted = Error
Predicted

3. “Residual” in statistics is the same as “error” Residual = Actual y – Predicted y
Source: 8/13/03
Positive residual

4. “Residual” in statistics is the same as “error” Residual = Actual y – Predicted y
Source: 8/13/03
Negative residual

5. Residual plot

6. 1-1 correspondence between every point on the scatterplot and the corresponding point on the residual plot

7. Residuals No Pattern Clear Pattern  Appropriate Model
Concave up or down
No Pattern
Clear Pattern
Increasing or decreasing
Too high or low
 Appropriate Model
 Inappropriate Model
Small Residuals
Large Residuals
 Appropriate Model
 Appropriate Model, But Not Very Useful

8. Pattern – Clear concave down pattern
Magnitude – Small residuals
Conclusion - Not an appropriate model

9. Pattern – No clear pattern
Magnitude – Fairly large residuals
Conclusion - Appropriate , but not very useful model

10. Pattern – No clear pattern
Magnitude – Small residuals
Conclusion - Very appropriate model

11. Pattern – Clear decreasing pattern
Magnitude – Small residuals
Conclusion - Not an appropriate model

12. Pattern – Clear pattern, residuals too low
Magnitude – Small residuals
Conclusion - Not an appropriate model

13. Residuals