I've never seen this claim convincingly supported in a way that partials out the effect of socioeconomic status, parental involvement, and geography. It's an ea

I've never seen this claim convincingly supported in a way that partials out the effect of socioeconomic status, parental involvement, and geography. It's an easy claim to support if you just look at straight averages. I'm sure there is information I'm not familiar with, but I'm unimpressed with the "citations" that have followed this claim in other conversations.