The effect of private schools?

Another study looking at the effect of private schools vs. public schools. This one is less positive about that effect, arguing that Catholic "holy order" schools are the only ones with significant benefit once all other factors are taken into consideration. The most interesting point for me is that parental involvement seems to be key. There's more parental involvement in private schools, hence better scores. Get more parents involved in public settings, and scores equal out.

http://news.yahoo.com/s/ap/20071010/ap_on_re_us/public_private_schools