[R] standardization

[bogdan romocea]

You asked another question about clustering, so I presume you want to
standardize some variables before clustering. In SAS, PROC STDIZE
offers 18 standardization methods. See
http://support.sas.com/91doc/getDoc/statug.hlp/stdize_sect12.htm#stat_stdize_stdizesm
for details. If you're really concerned about this I would suggest
running simulations to compare the performance of various
standardization methods (relative to your data and what you're after).

hth,
b.


-----Original Message-----
From: Philip Bermingham [mailto:pberming at research.ryerson.ca]
Sent: Wednesday, May 18, 2005 8:34 AM
To: r-help at stat.math.ethz.ch
Subject: [R] standardization


SAS Enterprise Miner recommendeds to standardize using X / STDEV(X) 
versus [X – mean(X)] / STDEV(X)

Any thoughts on this? Pros Cons

Philip

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