Today, we'll start covering exploratory factor analysis (EFA). We'll be drawing from three previous sets of lecture notes:

January 30, 2007 (these notes mainly)

January 22, 2008

February 2, 2007

UPDATE (February 10, 2010):

Here's a graphic display I created to illustrate the difference between using exact factor scores to make subscales vs. unit weighting. I also found a good online article by DiStefano et al. and a thorough PowerPoint show by Wuensch on the subject. You can click on the graphics below to enlarge them (note that there are TWO slides to click on, one on top of the other).