Hi Max, Thanks for your prompt reply. Actually I have already checked contrast package, but I still could not figure out how to set the contrast matrix for a 2x2 factorial design.
I would like to set a contrast exactly similar to the limma's user guide, 8.7 Factorial Designs (page 45). For example, after a mixed linear model fit with the default contr.treatment, I want to compute an estimated coefficient as the sum of the third and fourth coefficients of the original lme model (2x2 factorial design). Could you give me an example how to implement this using the contrast package? Thanks, Shirley On 7/9/07, Kuhn, Max <[EMAIL PROTECTED]> wrote: > Shirley, > > The contrast package can do this. The method of specifying the contrast > conditions/coefficients is different (and I think easier). > > Max > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of shirley zhang > Sent: Monday, July 09, 2007 11:16 AM > To: R-help@stat.math.ethz.ch > Subject: [R] similar limma's contrasts.fit() for lme (mixed effect > model)object > > Dear R help, > > In limma package, contrasts.fit() function is very useful. I am > wondering whether there is a similar function for lme object, which > means given a mixed linear model fit, compute estimated coefficients > and standard errors for a given set of contrasts. > > Thanks, > Shirley > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. > > ---------------------------------------------------------------------- > LEGAL NOTICE > Unless expressly stated otherwise, this message is confidential and may be > privileged. It is intended for the addressee(s) only. Access to this E-mail > by anyone else is unauthorized. If you are not an addressee, any disclosure > or copying of the contents of this E-mail or any action taken (or not taken) > in reliance on it is unauthorized and may be unlawful. If you are not an > addressee, please inform the sender immediately. > ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
