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17.4.4 Stepwise Poisson Regression ModelThe t-values tkℓ can be compared to a t-distribution to determine whether these valuesare significantly different from 0. In a so-called stepwise model, this significancetesting is used for attribute selection, finally resulting in a model only having significantattributes. The stepwise model approach starts off with a model containingall attributes. Then, each time the most insignificant attribute is deleted from themodel, until the model only contains significant attributes. Note that this stepwiseapproach leads to a different model when all insignificant attributes are deleted atonce. In fact, due to collinearity, significance of an attribute may change when anotherattribute is deleted. When using the stepwise model to determine weights wk,we consider Lk to be the number of dummies incorporated in the final model. Thisstepwise model is used in the application shown in Section 17.6.
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