[R] Normalization and missing values

[WeiWei Shi]

the way of scaling, IMHO, really depends on the distribution of each
column in your original files. if each column in your data follows a
normal distrbution, then a standard "normalization" will fit your
requirement.

My previous research in microarray data shows me a simple "linear
standardization" might be good enough for some purpose.

If your columns differ in magnitude, then some data transformation
like (log) might be needed first.

Ed


On 4/13/05, Achim Zeileis <Achim.Zeileis at wu-wien.ac.at> wrote:
> On Wed, 13 Apr 2005 14:33:25 -0300 (ADT) Rolf Turner wrote:
> 
> >
> > Bert Gunter wrote:
> >
> > > You can't expect statistical procedures to rescue you from poor
> > > data.
> >
> >       That should ***definitely*** go into the fortune package
> >       data base!!!
> 
> :-) added for the next release.
> Z
> 
> >                               cheers,
> >
> >                                       Rolf Turner
> >                                       rolf at math.unb.ca
> >
> > ______________________________________________
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> 
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