lme4 error: "Number of levels of a grouping factor . . ."

Gabrielle Miller-Messner <gmessner at ucdavis.edu>
    on Tue, 26 Jul 2011 22:26:38 -0700 writes:

    > Hello, I have count/proportion data and I am trying to
    > account for overdispersion in a logistic regression. With
    > the following code from lme4 I receive the following error
    > message:

    >> glmm = glmer(cbind(fertilized, unfert) ~ density.class +

    >                (1|individual), family = binomial) 
    > Number of levels of a grouping factor for the random effects
    > is *equal* to n, the number of > observations

    > This problem was mentioned in Warton and Hui 2011, so I
    > imagine it may have been fixed recently.  I downloaded the
    > most recent version of lme4 available through the command
    > install.packages("lme4").  Is there an updated version of
    > the package available in a different form?

{yes, lme4a on R-forge, but that's not the issue now, and not
 something I'd recommend to get into just right now ...}

Well, I'm puzzled that you say you get an *error* with the above
message.
You should get a message, but no error in the case of glmer().

Just to be sure:  What does  
     packageVersion("lme4")
say for you?

Martin

    > I am using R version 2.13.1 on OS 10.6.4.

    > thank you!  Gabrielle

    > -- 
    > Gabrielle Miller-Messner Graduate Student Center for
    > Population Biology Section of Evolution and Ecology
    > University of California, Davis 1 Shields Avenue Davis,
    > California 95616 gmessner at ucdavis.edu

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