“…Some studies explored this possibility (e.g., Rockof et al, 2011, who report diferences between survey responders and non-responders), and a few further studies attempted to account for bias arising from potential non-random teacher attrition in their analyses (e.g., Goldhaber et al, 2017); nevertheless, this remains a critical issue. In addition, participating (prospective) teachers were taken from single institutions, e.g., from one teacher education program (Henry et al, 2013), one university (e.g., Andrew et al, 2005), or one urban high-need and hard-to-staf school district (Gimbert & Chesley, 2009). Most authors were well aware of the non-representativeness of their samples and acknowledged this as a In regressions with teacher efectiveness in year 4 as outcome: signiicant, positive efect of SAT score equivalent (both when only SAT score equivalents entered as predictor and when SAT score equivalents and teacher efectiveness in year 2 entered as predictors); bivariate correlations: nonsigniicant positive relation with teacher efectiveness in year 2, signiicant positive relation with teacher efectiveness in year 4…”