Julien: Big difference! You need to spend time with Bates and Pinheiro to understand the concepts, but in brief:
~1|x/y means that x and y are grouping variables with y nested within x and a different random offset for each x and y within x. ~y|x means that x is a grouping variable and y is a linear covariate with a different random (intercept and) slope for each x group. -- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA "The business of the statistician is to catalyze the scientific learning process." - George E. P. Box -- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA "The business of the statistician is to catalyze the scientific learning process." - George E. P. Box > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Martin Julien > Sent: Tuesday, January 18, 2005 12:42 PM > To: [email protected] > Subject: [R] Randoms interactions in lme > > In lme, what's the difference between "random = ~ 1 | x / y" > and "random = ~ > y | x" ? > > > > Thanks > > Julien > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
