There is indeed a glitch in 'dredge' that prevents you from seeing the actual error message. It is explained in "?dredge", in section "Missing values". (it's been corrected now in 1.9.14, on R-forge)
kamil On 2013-11-08 11:00, r-help-requ...@r-project.org wrote:
------------------------------ Message: 26 Date: Thu, 7 Nov 2013 11:55:50 -0500 From: Martin Turcotte<mart.turco...@gmail.com> To:r-help@r-project.org Subject: [R] Error running MuMIn dredge function using glmer models Message-ID:<1e4f5497-ccb4-4e8b-a23a-8aa5e1136...@gmail.com> Content-Type: text/plain Dear list, I am trying to use MuMIn to compare all possible mixed models using the dredge function on binomial data but I am getting an error message that I cannot decode. This error only occurs when I use glmer. When I use an lmer analysis on a different response variable every works great. Example using a simplified glmer model global model: mod<- glmer(cbind(st$X2.REP.LIVE, st$X2.REP.DEAD) ~ DOMESTICATION*GLUC + (1|PAIR), data=st, na.action=na.omit , family=binomial) The response variables are the number of survival and dead insects (successes and failures) DOMESTICATION is a 2 level factor. GLUC is a continuous variable. PAIR is coded as a factor or character (both ways fail). This model functions correctly but when I try it with dredge() I get an error. g<- dredge(mod, beta=F, evaluate=F, rank='AIC') Error in sprintf(gettext(fmt, domain = domain), ...) : invalid type of argument[1]: 'symbol' When I try with another rank the same thing happens: chat<- deviance(mod)/58 g<- dredge(mod, beta=F, evaluate=F, rank='QAIC', chat=chat) Error in sprintf(gettext(fmt, domain = domain), ...) : invalid type of argument[1]: 'symbol' Any suggestions would be greatly appreciated thanks Martin Turcotte, Ph. D. mart.turco...@gmail.com
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