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Poisson Regression |
Click on YEAR*PERIOD in the fit window. |
Choose Edit:Delete from the menu. |
Follow the previous steps to remove the other two interaction terms from the model. The resulting main effects model is shown in Figure 17.9.
The estimate of the dispersion parameter
suggests that overdispersion exists in the model.
Type III (Wald) Tests table shows that
all of the main effects are significant.
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