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measure_disk
2006 Dec 28
0
lmer: Interpreting random effects contrasts and model formulation
...ome
questions about the output and my model formulations.
I have replicate measures on Lines which are strictly nested within
Populations.
(a) So if I want to fit a model where Line is a random effect and
Populations are fixed and the random Line effect is constant across
Populations, I have:
measure_ijk = mu + P_i + L_ij + e_ijk where L ~ N(0,s_L)
measure ~ 1 + Population + (1|Population:Line)
(b) If instead I want to allow the random Line effect to be Population
specific, I put:
measure_ijk = mu + P_i + L_ij + e_ijk where L_i ~ N(0,s_L_i)
measure ~ 1 + Population + (Population | Population:Line...