Hi,

I'm trying to user lmer function from lmerTest package because, if I
understood correectly, it allows to make better inference than lmer method
from lme4 package. However, whatever I do I keep getting this error:

Error in lme4::lFormula(formula = mark ~ ssCount + sTime+  :  rank of X =
1660 < ncol(X) = 1895

any ideas what could be a problem?

thanks,
Srecko

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