R 3.3.0 is not a released version of R. It appears that you have obtained a 
version of lme4 that is ahead of its time. This would have been a perfect time 
for you to have followed the Posting Guide mentioned below (in particular the 
inclusion of complete version information such as the sessionInfo function 
would provide). If you obtained your lme4 through CRAN, the maintainers made a 
mistake.  If you found it somewhere else then you are the one who erred. Since 
it loads fine for me my bet is on your mistake. 
-- 
Sent from my phone. Please excuse my brevity.

On February 3, 2016 7:25:04 AM PST, Sarah Brennenstuhl 
<sarah.brennenst...@utoronto.ca> wrote:
>Hi there!
>
>I having a problem loading lme4. When I try to load the package I get
>the following error message:
>
>Error : object 'sigma' is not exported by 'namespace:stats'
>In addition: Warning message:
>package 'lme4' was built under R version 3.3.0
>Error: package or namespace load failed for 'lme4'
>
>Any suggestions for resolving this problem?
>
>Thanks,
>
>Sarah
>
>       [[alternative HTML version deleted]]
>
>______________________________________________
>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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