Poisson Regression
Deviance Residuals versus Fits
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Poisson RegressionDeviance Residuals versus Fits |
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This graph plots the residuals versus the fitted values. The residuals should be scattered randomly about zero. Use this plot to look for the following:
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This pattern... |
Indicates... |
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Fanning or uneven spreading of residuals across fitted values |
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Curvilinear |
A missing higher-order term |
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A point far away from zero |
An outlier |
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A point far away from the other points in the x-direction |
Example Output |
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Interpretation |
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For the resin defect data, there is a clear curve in the data. This pattern reveals a problem with the model. In this case, the analysts find that interactions that are in the data are not in the model.
Free online chart generators for statistical analysis:
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