As reported in The New York Times, thirty-seven of Newsweek’s top 50 high schools have selective admission standards, thereby enrolling the cream of the eighth grade crop. That means that when these high scoring eighth graders reach eleventh grade, they’ll be high scoring eleventh graders, helping the school move up the Newsweek rankings. These selective admission schools simply have to avoid screwing up their talented students.
That’s no way to determine how good a school is. The measure of a good education should be to assess how well students did in that school compared to how they would have been predicted to do if they had gone to other schools.
Imagine two liver transplant programs, one whose patients experience 90% survival in the year following their transplant and the other whose patients experience only a 75% survival rate. Based on that information, the former hospital looks like the place to go when your liver fails. But aren’t you curious about the kind of patients that receive care in these two hospitals? Wouldn’t you want to know whether that first hospital was padding its statistics by selectively transplanting relatively healthy patients?