I read somewhere (help list, documentation) that the random effects in lme4
uses sparse matrix "technology".
I'd like to confirm with others that I can't use a sparse matrix as a fixed
effect? I'm getting an "Invalid type (S4) " error.
Thanks.
~~~~~~~~~~~~~~~~~~~
-Robin Jeffries
Dr.P.H. Candidate in Biostatistics
UCLA School of Public Health
rjeffr...@ucla.edu
530-624-0428
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