1. We perform best subset, forward stepwise, and backward stepwise selection on a single data set. For each approach, we obtain p + 1 models, containing 0, 1, 2, ..., p predictors.
(a) Which of the three models with k predictors has the smallest training RSS?
(b) Which of the three models with k predictors has the smallest test RSS? |
发表于 2013-10-11 23:41:24