Question: Reconsider the drill data from Problem 13.16. Fit a GLM using the log link and the gamma distribution, but expand the linear predictor to include

Reconsider the drill data from Problem 13.16. Fit a GLM using the log link and the gamma distribution, but expand the linear predictor to include all six of the two - factor interactions involving the four original regressors.

Compare the model deviance for this model to the model deviance for the

“ main effects only model ” from Problem 13.16. Does adding the interaction terms seem useful?

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