[R-sig-ME] Variances and standard errors of predicted values following lmer()

matthias.suter at art.admin.ch matthias.suter at art.admin.ch
Wed Nov 14 15:10:29 CET 2012

Dear R users

Does anybody know how to receive the variances (and standard errors) of predicted values following a fit with lmer()? I should only consider the variance of predicted values corresponding to the fixed estimates (I need no prediction to the random part). To my knowledge, a predict() function to an lmer() object is not implemented yet?

Given a matrix of new predictors (matrix of new data corresponding to the fixed effects), and the variance-covariance matrices of fixed (vcov) and random (VarCorr) effects from the lmer.output, it should be possible the calculate the variances of predicted values. Can somebody help?

Matthias Suter,
Agroscope Reckenholz-Tänikon ART, Zürich

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