Question: 7.23 Consider logit models for a four-way table in whichX1,X2, andX3 are predictors of Y . When the table is collapsed overX3, indicate whether the

7.23 Consider logit models for a four-way table in whichX1,X2, andX3 are predictors of Y . When the table is collapsed overX3, indicate whether the association between X1 and Y remains unchanged, for the model

(a) that has main effects of all predictors,

(b) that has main effects of X1 and X2 but assumes no effect for X3.

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