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phi_1
2005 Apr 22
1
lme4: apparently different results between 0.8-2 and 0.95-6
...effects: x1 is a two level factor; x2 and x3 are
continuous. We are including random intercepts for YEAR and SITE. On
subject-matter considerations, we are also including a random coefficient
for x3 within YEAR.
Neglecting the log link, the model is
y_{i,j} = x'_i \beta + \eta_i + z'_i \phi_j + \epsilon_{i,j}
where
i indexes SITE and j indexes YEAR,
\beta is the vector of fixed effects
\eta_i in the random intercept for SITE
and
\phi_j are the random intercept and coefficient for YEAR.
I have written x'_i because the covariates are assumed (reasonably) to be
constant over...