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The Accuracy of Aggregate Student Growth Percentiles as Indicators of Educator Performance
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Castellano, Katherine E.; McCaffrey, Daniel F. – Educational Measurement: Issues and Practice, 2017
Mean or median student growth percentiles (MGPs) are a popular measure of educator performance, but they lack rigorous evaluation. This study investigates the error in MGP due to test score measurement error (ME). Using analytic derivations, we find that errors in the commonly used MGP are correlated with average prior latent achievement: Teachers…
Descriptors: Teacher Evaluation, Teacher Effectiveness, Value Added Models, Achievement Gains