Hi, I noticed your old posts whilst tidying up my mailbox. I am struggling trying to understand the code to define new structures - part of the real work is hidden away in C code and I don't speak C very well. Have either of you successfully implemented any alternative structures? (At one stage I ws interested in trying Toeplitz forms, and now have a need for compound symmetry forms where the rho depends on a factor.) Have you anything beyond the source that might help? - for example a more richly commented example, or notes on what the C (and R) functions actually do.
Regards, Steve. Date sent: Wed, 23 Mar 2005 10:56:46 +1100 To: "Michael Jerosch-Herold" <[EMAIL PROTECTED]>, R-help@stat.math.ethz.ch From: Simon Blomberg <[EMAIL PROTECTED]> Subject: Re: [R] LME correlation structures: user defined Copies to: > >Let me modify my question about user-defined covariance structures > >for LME models: Can somebody tell me how I can see the code for the > >definition of the correlation structures that come with the NLME > >package. Specifically I like to see the code for the functions coef, > >corMatrix, and intialize for any of the pre-defined correlation > >structures, and use this as a template to define a new correlation > >structure. So how do I see e.g. the code for the method initialize > >for the correlation structure corExp or corARMA? > > I'm interested in this too. Go to CRAN and download the source code > for the nlme package. ungzip and untar it. Got to the R subdirectory. > Inside that is a file called corStruct.R with all the method > definitions for the built-in corStruct classes. Reading those should > help. > > Cheers, > > Simon. > > > > > >thank you in advance! > > > >Michael Jerosch-Herold > > > >PS: Oh, and if somebody could still send me example code for a user > >defined correlation structure I would much appreciate it, as my > >previous requests for help have not yielded any response. > > > >______________________________________________ > >R-help@stat.math.ethz.ch mailing list > >https://stat.ethz.ch/mailman/listinfo/r-help > >PLEASE do read the posting guide! > >http://www.R-project.org/posting-guide.html > > > -- > Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat. > Visiting Fellow > School of Botany & Zoology > The Australian National University > Canberra ACT 0200 > Australia > > T: +61 2 6125 8057 email: [EMAIL PROTECTED] > F: +61 2 6125 5573 > > CRICOS Provider # 00120C > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html Dr Steve Roberts [EMAIL PROTECTED] Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192/5764 / 0161 276 5785 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html