Hi I am not at all an expert in this matter, so you shall copy you message to r-help list too. However I would try na.action=na.exclude as it shall preserve the length of variables.
Regards Petr > > Hi, > > Sorry I didn't know the original post in this thread was not included. I'm > using R version 2.14.0 (2011-10-31). > > This is the program: > > fitLME4 <- lme(iadl ~ obstime, > random = ~ obstime | id, data = iadl.long.df, na.action=na.omit) > fitSURV <- coxph(Surv(Time, death) ~ agew1, data = last_aa.df, x = TRUE) > fit.JM4 <- jointModel(fitLME1, fitSURV, timeVar = "obstime", method = > "piecewise-PH-GH") > > This is the error message: > > Error in jointModel(fitLME1, fitSURV, timeVar = "obstime", method = > "piecewise-PH-GH") : > sample sizes in the longitudinal and event processes differ; maybe you > forgot the cluster() argument. > > I have missing data in the lme data and that's why I used na.omit. But > results of the lme and coxph show the same number of participants. > > From lme: > Number of Observations: 4818 > Number of Groups: 2087 > > From coxph: > n= 2087, number of events= 1721 > > If the number of groups in lme = n in coxph, why am I getting the error > message that sample sizes differ? > > Many thanks for your help. > > Helena > > ________________________________________ > From: Petr PIKAL [petr.pi...@precheza.cz] > Sent: Thursday, March 01, 2012 6:17 PM > To: Helena Chui > Cc: r-help@r-project.org; r-help-boun...@r-project.org > Subject: Re: [R] the problem about sample size > > Hi > > > > Hi, there, > > > > I run into the same sample size error in JM. Have you found the solution > for > > the error? > > What error? > Petr > > > > > Many thanks, > > Helena > > > > -- > > View this message in context: http://r.789695.n4.nabble.com/the-problem- > > about-sample-size-tp1592855p4434009.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. ______________________________________________ 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.
