Re: R-beta: repeated measures

Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
25 Feb 1998 11:34:18 +0100


To: Jim Lindsey <jlindsey@luc.ac.be>
Subject: Re: R-beta: repeated measures
From: Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk>
Date: 25 Feb 1998 11:34:18 +0100
In-Reply-To: Jim Lindsey's message of Wed, 25 Feb 1998 10:42:00 +0100 (MET)

Jim Lindsey <jlindsey@luc.ac.be> writes:

> >     Jim> R itself has nothing for repeated measures. However, I am developing a
> >     Jim> complete set of four libraries that will handle most any repeated
> >     Jim> measures problem, normally distributed or other. This includes two
> >     Jim> functions in one of the libraries that will do the so-called anova
> >     Jim> approach plus ARMA. They will do everything in my Repeated
> >     Jim> Measurements book (OUP 1993) and much more.
> >     Jim> I am waiting until R stabilizes a bit before releasing them but will
> >     Jim> soon be asking for volunteers to aid in preliminary testing.
> >     Jim> Jim
> > 
....
> > 
> > He was also badly missing S-plus's  aov(.) function...
> > and I explained how he could  use   anova( lm(...) ) for FIXED effects
> > anova, and that nothing is yet available for random (or mixed) effects.
> > 
> > Martin.
> > 
> Just a warning. These things are not as simple as aov. It should still
> be implemented! Mine are general enough to do any nonlinear model for
> both mean and variance (e.g.PKPD), generalized linear mixed models,
> multivariate survival with any censoring pattern, completely
> unbalanced data, etc. Hence, with this level of generality, the
> interface is not always that simple: lists of time-varying covariates etc.
>   Jim

Yes. We need aov().

Also note that Bates & Pinheiro are in the process of porting lme
(linear mixed effects models) to R. From what I have seen, this does
at least what SAS PROC MIXED does, only better...

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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