[R] Problem in lme4

From: Doran, Harold <HDoran_at_air.org>
Date: Sat 03 Jul 2004 - 00:58:47 EST

Dear List:  

I was able to run the following in nlme successfully, but the same model and code (same dataset) failed to run in lme4 and gave me the error message below. Any thoughts?  

lme(math~year, data=egsingle, random=~year|schoolid/childid)  

Error in lme(formula = math ~ year, data = egsingle, random = structure(list( :

        Unable to invert singular factor of downdated X'X  


        [[alternative HTML version deleted]]

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