Stepwise Regression Explained: A Clearer Approach to Factor Selection

In the section on 'factor selection', the introduction of the stepwise regression method was not clear enough, especially as we only provided the regression equation formula, which is not very appropriate. We have rewritten this section, focusing on the core ideas of this method. As for the detailed steps of this method, the introduction is lengthy, so we have chosen to reference a literature on the method, which provides clear instructions for each step.