(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?
