Reconsider Problem 2.16. Using the data on the Clean Data worksheet tab, partition the historical records into a training partition (60 percent of the records)

and a validation partition (the remaining 40 percent of the records).

a. Determine the accuracy, sensitivity, and specificity for the KNN model with k = 10 (based on the historical data in the training partition), when it is used to classify applicants as to whether they are likely to default (defined as greater than a 10 percent chance of default).

b. Generate the lift chart for the algorithm with k =

10.