I came across the following problem:

require(nlme)
require(gmodels)
fm2 <- lme(distance ~ age + Sex, data = Orthodont, random = ~ 1)
ci(fm2)
mm <- unique(model.matrix(with(Orthodont, distance ~ age + Sex)))
estimable(fm2, cm = mm, conf.int = 0.95)
# Error in function (classes, fdef, mtable)  :
#  unable to find an inherited method for function "fixef", for  
signature "lme"
_____________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
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