Hi all

After upgrading my Mac's OS to Maverick in April, I have to upgrade R to R
3.1.0 (Mavericks). I need to use the lme4 package to run linear
mixed-effect models. But when I run the same script which works very well
on previous R version, I got the error message that said "could not find
function "lmer""​.

After installing R3.1.0, I installed several packages as usual:
install.packages (c("rpart", "chron", "Hmisc", "Design", "Matrix", "lme4",
"coda", "e1071", "zipfR", "ape", "languageR"))

Then I run the following command every time:
library (LanguageR)

I tried to check each function (e.g. library (lme4)). The lmer function
seems work, but the output is wrong. I also tried to install the R-3.0.3
instead. I got the same error message as well.

I am not very familiar with R-language. I wonder if anyone had this problem
before and find a solution to it? Thanks a lot!

Best,
Yingying

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