Comment by jeffbee

That article mentions family income as possible confounder only once, while in an article of this extent I would expect it to appear dozens of times and be the central point. You simply cannot draw conclusions from comparing general populations and kids in schools that cost $500k for a 13-grade education, or that cost any amount. Students from low income households have so many headwinds. They don't come to school because their transportation is unreliable, because their teeth hurt, because they can't afford sanitary pads, they can't sleep because their neighborhoods are too loud, and so on. When this school opened in Brownsville and preferentially enrolled only the children of employed aeronautical engineers, that precluded any possible comparison of outcomes.