Selection bias, the real teacher.

Selection bias, the real teacher. “In the world of educational data, “too good to be true” usually means there is a hidden variable in how the data was collected or filtered.” Readers may remember that I’m bullish on Alpha School’s claims on student education outcomes. Of course there’s tons of selection bias. Luke Shepard digs into Alpha School’s glossy test score claims and keeps coming back to the denominator: who got counted, who got excluded, and who could even afford to be there. ~ learn more