


Hi all,       Thanks a lot. Besides, is there a way to do this task just in 1 line of code? Thats is, combine  age<-relevel (age,ref = "3")lme( ...) into: lme(...) and have the same effect? Lawrence> From: a.renwick@abdn.ac.uk> To: lawandqueen@hotmail.com; r-sig-mixed-models@r-project.org> Date: Tue, 27 Jan 2009 09:51:54 +0000> Subject: RE: [R-sig-ME] (no subject)> > If I understand your question correctly you need to relevel your variable:> age<-relevel(age,ref="3")> Then rerun the model and age3 should be used as the reference group> > -----Original Message-----> From: r-sig-mixed-models-bounces@r-project.org [mailto:r-sig-mixed-models-bounces@r-project.org] On Behalf Of Lawrence Lee> Sent: 27 January 2009 09:24> To: r-sig-mixed-models@r-project.org> Subject: [R-sig-ME] (no subject)> > > Dear all,> > Does anyone know how to change the reference group within lme().> For example,> lme(fixed = obs ~ line + age - 1,random = ~1 |sire, data = lambweight)> > Suppose age has 3 levels, so the code above will give me estimate of age2 and age3:> > Fixed effects: obs ~ line + age - 1 Value Std.Error DF t-value p-valueline1 10.491153 0.7261881 18 14.446882 0.0000line2 12.290287 0.8242309 18 14.911219 0.0000line3 11.032864 0.7647870 18 14.426061 0.0000line4 10.276735 0.7389137 18 13.907897 0.0000line5 10.952840 0.6084109 18 18.002373 0.0000age2 -0.155435 0.7157030 38 -0.217178 0.8292age3 0.009646 0.5481034 38 0.017599 0.9861> > How I can change within lme() in order to give me the estimate of age1 and age2.> > > Thanks,> Lawrence> _________________________________________________________________> > > ore_012009> [[alternative HTML version deleted]]> > _______________________________________________> R-sig-mixed-models@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models> > > The University of Aberdeen is a charity registered in Scotland, No SC013683.

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