I've heard two different figures for Caltech. The 17 figure I read on Steve Hsu's blog; presumably he has the same source as you, although I assumed he was ref

I've heard two different figures for Caltech. The 17 figure I read on Steve Hsu's blog; presumably he has the same source as you, although I assumed he was referring to undergrad only. That assumption seems to have been a mistake. The reason I made the assumption is that while I was a postdoc, one of the oncampus papers ran an article that set the number at 27, if I recall correctly, roughly equally split between undergrad and grad. In either case they're a long way ahead of other US Schools.