(a) In the use of a categorical variable with n possible values, explain the following: 1. Why only n 1 binary variables are necessary 2. Why using n variables would be problematic(b) Describe how logistic regression can be used as a classifier.(c) Discuss how the ROC curve can be used to determine an appropriate threshold value for a classifier(d) If the probability of an event occurring is 0.4, then 1. What is the odds ratio? 2. What is the log odds ratio?
Categorical variable
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