![]() ![]() Model matrix is rank deficient geeglm can not proceed". The error code I get is "Error in QIC(global.model) : Id = plete$ID, family = "gaussian", corstr = "exchangeable", Gee.min$call <- wgee(model = IMPS79 ~ Drug + Sex + Time + repd, data = plete, # note that the call argument cannot be updated doesn't workÄredge(gee.min,fixed=c("Drug","Sex"),rank="QIC",evaluate=FALSE), #try the solution from other stackoverflow page. Gee.min$model <- IMPS79 ~ Drug + Sex + Time + repd #update model argument Gee.min$model #IMPS79 ~ Drug + Sex + Time Gee.min <- wgee(IMPS79 ~ Drug+Sex+Time, data=plete,Ĭorstr="exchangeable", scale=NULL) #this model can be fit plete$repd<- wgee(IMPS79 ~ Drug+Sex+Time+repd, data=plete, Here is a reproducible example from R using the IMPS longitudinal dataset. However, I can't get this to work while using the wgee() function from the wgeesel package. This was done by fitting a smaller global model that worked, updating the formula argument of that model, and using that. On this question a similar problem was resolved by "tricking" MuMIn. However, when I use the dredge function from the MuMIn package, my global model is rank-deficient. I am trying to do forward model selection between marginal models fit with GEE, using Quasi-Akaike Criterion (QIC) as the selection criterion. ![]()
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