[R-sig-ME] error regarding levels in grouping factor

Sharif S. Aly saly at ucdavis.edu
Mon Dec 10 03:08:06 CET 2007

Dear R-mixed models list,
After running a mixed model with level 4 and 3 crossed with level 2,
and level 2 nested within level 1:

lmer(y~ 1 + (1|level1/level2)+(1|level3)+(1|level4),data)

I get the following error:

number of levels in grouping factor(s) ‘level2

Would someone kindly give me some insight as to what may have caused
this error or how to remedy this problem?

Best regards,

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