Thanks for reporting, Rick. I'm sick at home and couldn't make it. I like these, though I think "statisticians" tend to abuse aggregation, and I spend a lot of time undoing that so that I can aggregate correctly. And, FWIW, I think regression to the mean is (vastly) interesting for historical reasons, and thus to the historian Stigler, but maybe for the same reasons isn't such a great thing to pull up as an example of multivariate analyses.