Dear Axel, A few quick remarks.
1) This question is more suitable for r-sig-mixed-models. 2) A mixed model needs much more than two groups. If you have only a few groups, consider a glm with group interactions. 3) Setting the value of a covariate to zero for a set of observations has the same effect as setting its coefficient to zero for that set of observations. Best regards, ir. Thierry Onkelinx Statisticus / Statistician Vlaamse Overheid / Government of Flanders INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND FOREST Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance thierry.onkel...@inbo.be Havenlaan 88 bus 73, 1000 Brussel www.inbo.be /////////////////////////////////////////////////////////////////////////////////////////// To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey /////////////////////////////////////////////////////////////////////////////////////////// <https://www.inbo.be> Op ma 13 jul. 2020 om 16:00 schreef Axel Urbiz <axel.ur...@gmail.com>: > Dear List, > > I’d appreciate any guidance on the following. > > I’m using a mixed effects logistic regression model, to allow coefficients > to vary by a group variable. However, my case is not typical in the sense > that I need to specify a different set of covariates for each level of the > group variable. Say I have 3 covariates {x1, x2, x3} and 2 groups {g1, g2}. > I want to specify a model for g1 that only depends on x1 and x2, and a > model for g2 that only depends on x2 and x3. > > Is this possible with lme4? > > Thanks, > Axel. > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
