Copyright © 2003, N. Ahbel Residuals. Copyright © 2003, N. Ahbel Predicted Actual Actual – Predicted = Error Source:

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Copyright © 2003, N. Ahbel Residuals

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

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

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

Copyright © 2003, N. Ahbel Residual plot

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

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

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

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

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

Copyright © 2003, N. Ahbel Residuals