The credit rating data from Exercise 12 27 were reanalyzed using
The credit rating data from Exercise 12.27 were reanalyzed, using only the monthly in-come variable as a predictor. JMP results are shown.
a. By how much has the regression sum of squares been reduced by eliminating age and debt percentage as predictors?
b. Do these variables add statistically significant (at normal a levels) predictive value, once income is given?
In exercise
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