[R] Specify correlation structure in lme4
bolker at ufl.edu
Thu May 20 19:52:53 CEST 2010
Thomas Stewart <tgstewart <at> gmail.com> writes:
> If I have the mixed-model with
> lmer( y ~ x1 + x2 + (1 | id) + (z1 | w ) , ... )
> there is no way for me to specify a correlation structure for the random
> effects? Right?
> If I want to specify correlation structure then I need to use lme in the
> nlme package? Right? Crossed Random effects are coded with the pdBlocked
> syntax? Right?
Right on all counts (see Pinheiro and Bates 2000 for details
of crossed-effect coding with pdBlocked). In general it might
be better to send these types of questions to r-sig-mixed-models
instead of r-help ...
More information about the R-help