Question: Consider data involves a binary response Y and a categorical predictor X that has K levels. We define (K 1) dummy variables {Z1, Z2,...,ZK1}

Consider data involves a binary response Y and a categorical predictor X that has K levels. We define (K − 1) dummy variables {Z1, Z2,...,ZK−1} using the reference cell coding scheme such that Zik = " 1 if the ith subject falls into the kth category, 0 otherwise, for k = 1, 2,...,K −

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