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2007 Sep 28
0
lmer giving negative, or no, estimated standard errors
R Users, Emine Bayman sent this out earlier and we do not think it went through. Appologies if it did. We want to fit GLMM with lmer with binomial data and a one-way random effects model (overall mean is a fixed effect and there are random effects for each binomial). We are using the Laplace method. We are simul...
2007 Jun 01
2
Interaction term in lmer
Dear R users, I'm pretty new on using lmer package. My response is binary and I have fixed treatment effect (2 treatments) and random center effect (7 centers). I want to test the effect of treatment by fitting 2 models: Model 1: center effect (random) only Model 2: trt (fixed) + center (random) + trt*center interaction. Then, I want to compare these 2 models with Likelihood Ratio Test.
2007 Sep 25
0
R lmer with problem of 'sd slot has negative entries'
...(example3) se.fixef(example3) example4 <- lmer(cbind( y, n - y) ~ 1 + ( 1 | center) , family = binomial, niter = 50, method = "PQL",control = list (usePQL = FALSE)) fixef(example4) se.fixef(example4) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Emine Ozgur BAYMAN PhD Student Department of Biostatistics, College of Public Health, University of Iowa Office: 2400D UCC, Iowa City / IA Office Phone: (319) 384 27 52 e-mail: emine-unlu@uiowa.edu [[alternative HTML version deleted]]