On Sep 10, 2012, at 5:14 PM, semperparatus wrote: > Your problem seems to be exactly the problem I've been having for the past > week. So glad to find this thread. > However, when I follow the syntax you used to get around the issue, I still > didn't get the output to work in the way yours did. I don't believe my > factors are truly nested however (nor your factors: if A, B, C, and D occur > in both levels 1 and 2, the effects would be crossed). > > I have a model with the variable condition, and the variable patient > (indicating whether the subject is a patient or control) with repeated > measures per subject, and the following is the model I had: > MLsd = lmer(H.y.~patient*stance*cond + (1|subj), data=H) > > I want to be able to look at the same contrast set up you were interested > in, and compare patient to control at every level of the variable condition > (cond). > > *When I tried using the syntax you used with my model: > lmer(H.y.~patient*stance*cond+(cond/patient) + (1|subj), data=H), I got this > result, which seems to be using condition 1 as a part of the baseline. Any > idea how to change that?*
Why would you want to change it? `(Intercept)` is really control:cond1:stance1 and then all the other estimates are for differences from that baseline. -- David. > > Fixed effects: > Estimate Std. Error t value > (Intercept) 0.552594 0.012774 43.26 > patient1 -0.005951 0.016989 -0.35 > stance2 -0.009010 0.014577 -0.62 > cond2 -0.023666 0.007028 -3.37 > cond3 -0.015469 0.006948 -2.23 > patient1:stance2 0.027988 0.019472 1.44 > patient1:cond2 0.015981 0.009977 1.60 > patient1:cond3 0.014622 0.009905 1.48 > > Best, > Rachel > (M.S. candidate frantically working to finish her master's project in the > coming week or so) > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Contrasts-for-2x4-interaction-in-mixed-effects-model-tp4642536p4642710.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > 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. David Winsemius, MD Alameda, CA, USA ______________________________________________ R-help@r-project.org mailing list 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.
