[R] Announce: multilm

[Torsten Hothorn]

On 24 Sep 1999, Peter Dalgaard BSA wrote:

> Torsten Hothorn <hothorn at statistik.uni-dortmund.de> writes:
> 
> > I'm not sure if those basic methods fit most users needs, maybe wrappers for
> > special models (MANOVA) are required.  I'm very grateful for any hint and
> > discussion, mails of common interest please to the R-list, others to my
> > email address.
> 
> Now I didn't actually try this (yet), but one thing that reduces the
> practical value of these models is missing values. Is there any
> provision to handle these? Someone mentioned code to handle
> multivariate normals with missings earlier today, how do the two
> packages get along? 

Laeuter and Kropf discuss the handling of missing values in their paper

Kropf et.al: Stabilized Multivariate Tests - The Inclusing of Missing
Values, Biometric Journal 39, pp. 149-169

They use the variable mean instead of NA's.

PLEASE note: there is an mistake in multilm_0.1.tar.gz, I corrected it and
uploaded multilm_0.1.tgz.

Torsten

> 
> I did some special cases of this for a project a couple of years back
> where I did polynomial curve fits to repeated measurements of bone
> metabolism data. In those data, an overall rate of 10% missing data
> would result in losing half the data set for complete-case analyses.
> 
> -- 
>    O__  ---- Peter Dalgaard             Blegdamsvej 3  
>   c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
>  (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
> 

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