Which of these statements is a characteristic of the stepwise regression procedure?
(I) It chooses the jointly most 'important' explanatory variable from a set of candidate variables
(II) It can start with no variables in the regression and then it selects first the variable with the lowest p-value
(III) It can start with no variables in the regression and then it selects first the variable with the highest p-value
A) I only
B) II only
C) III only
D) Both I and II

Question

Quizplus · Accepted Answer

Stepwise regression is a method of fitting regression models in which the choice of predictive variables is carried out by an automatic procedure. It starts with no variables in the model (forward selection) and adds the most significant variable at each step. It can also start with all candidate variables and remove the least significant variable at each step (backward elimination). This process involves looking at the p-values of the variables, where a lower p-value indicates a more significant variable.

Which of These Statements Is a Characteristic of the Stepwise