Hello everyone,

It looks like the / command in lmer  (or glmer), when used for fixed
effects, is fitting a stratified model.

For example, we have two IVs A and B that we are interested in modeling as
fixed effects. A has two categories A1 and A2. We will also model the random
effect R.

Model:  Y ~  A/B + (1|R)

This model produces fixed effect estimates for A, A1:B, and A2:B

It seems that here A1:B and A2:B are stratified fits, with B fit for the A1
sample set and A2 sample set separately.

Is this correct? If not, what is the syntactic sugar "/" doing?

Thanks in advance for your help.
Derek
--
Derek Dunfield, PhD
Postdoctoral Fellow, MIT Intelligence Initiative
Sloan School of Management
MIT Neuroeconomics Research Center, Prelec Lab
77 Massachusetts Ave E62-585
Cambridge MA 02139

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