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Hi, How extract the Variance and Covariance Matrices D of random effects and R of error in the lme object? Thanks in advance. Alexandre Galv??o
The model is Y = XB + Zg + e where g~N(0, D) e~N(0, R) How to extract the VAR(g)= D, VAR(e)=R and V=ZDZ'+R? thanks
Hi Douglas, I need to find the matrix V=ZDZ'+R, for example: require(nlme) data(Orthodont) attach(Orthodont) fm1 <- lme(distance ~ age + Sex, data = Orthodont,random=~age) X<-model.matrix(distance ~ age + Sex) Z<-model.matrix(distance ~ age + Subject...
Dear Christoph, You can use the package gregmisc require(gregmisc) C<-c(0,1,-1) glh.test(my.lm,C) I hope that helps Alexandre Galv??o > Hi > > Let's assume, we have a multiple linear regression, such as the...
Hi, I'm having some problems regarding the packages lme4 and nlme, more specifically in the denominator degrees of freedom. I used data Orthodont for the two packages. The commands used are below. require(nlme) data(Orthodont) fm1<-lme(distance...
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