[R-sig-ME] Structural zeros in lme4

Hadley Wickham hadley at rice.edu
Wed Oct 6 15:27:27 CEST 2010

> I don't know of an easy way of doing that but, as you are the second
> person in as many weeks to pose such a question, it is obviously a
> situation that we should accommodate.

Well, it's not easy, but you can do:

  ra_age_sex <- interaction(ra, age, sex, drop = T)

and then model with

  success ~ ra_age_sex + (1|ind)

The hard part is creating the contrasts that take you back to the
questions you're interested in.


Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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