[R-sig-ME] About warning

[Atsuko Nakagawa]

Hi

Thank you very much for your help.

When we ran Package lme4 to our longitudinal data, we got following 
warnings repeatedly.

> fixed-effect model matrix is rank deficient so dropping 2 columns / 
> coefficients
> boundary (singular) fit: see ?isSingular 
Nevertheless, we got some results. Are these valid?
When I look for the Q&A in some Statistic Forums, sometimes I found the 
previous answer that we do not have to care these warnings.

In actuality, how do we deal with these warnings?

Thank you for your time.

Atsuko Nakagawa

Graduate School of Humanities and Social Sciences, Nagoya City 
University, JAPAN




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