If you have ever wondered about the validity of the U.S. News & World Report rankings of high schools, you will enjoy reading Gary Rubinstein’s explanation of how the rankings are calculated. This year, 34 of the top 100 high schools, according to U.S. News, are charter schools. Readers of this blog know how assiduous many charter schools are in choosing their students and in getting rid of the low performers. Without information about attrition, it is hard to know what to make of these rankings.

Gary teaches at Stuyvesant High School, which is an extremely difficult school to gain admission to. Incoming students must pass a rigorous exam and must receive very high scores. Yet one of the New York City KIPP high schools was ranked higher than Stuyvesant.

This piqued Gary’s curiosity, and he looked closely at the KIPP data. What he discovered might surprise you. If nothing else, it will persuade you–as it did me–that the U.S. News rankings are baloney.