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...z.ch/pipermail/r-sig-mixed-models/2019q1/027620.html) but this might rather need to go to r-devel anyway, so reposting here: I came across a weird problem / bug with augPred() from nlme (nlme_3.1-137). Here is a reproducible example to illustrate the issue (tested on R 3.5.2 and R-devel 2019-03-03 r76192): library(nlme) dat <- data.frame(id = c(1,1,1,2,3,3,4,4,4,4), xi = c(1,2,3,1,1,2,1,2,3,4), yi = c(2,1,4,2,3,2,5,4,6,8), zi = c(rep("a",9), NA)) res1 <- lme(yi ~ xi, random = ~ 1 | id, data=dat) sav1 <- augPred(res1, primar...