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most citedA Correlated Random Effects Model for Nonignorable Missing Data in Value-Added Assessment of Teacher Effects

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math.ST2020

A Diagnostic for Bias in Linear Mixed Model Estimators Induced by Dependence Between the Random Effects and the Corresponding Model Matrix

Andrew T. Karl, Dale L. Zimmerman

We explore how violations of the often-overlooked standard assumption that the random effects model matrix in a linear mixed model is fixed (and thus independent of the random effe…