[R] Homogenous groups building - Randomisation

From: <a.menicacci_at_fr.fournierpharma.com>
Date: Tue 17 Jan 2006 - 04:05:45 EST

Dear R-users,

We expect to form N homogeneous groups of n features from an experimentation including N*n data.
The aim is to prevent group effects.
How to do that with R functionalitites ? Does anyone know any way enabling this ?

Example :

100 patients are observed. 3 biochemical parameters are mesured for each one (Red and white globules ans glycemia).

Patient          RG           RW          Gly
1              3.4      1.38         1.62
2              1.8      1.19     1.55
3              1.9      1.26     1.77
4              3.0      1.29     1.72
5              1.9      1.09     1.72
6              3.3      1.31     1.63
...                  ...             ...      ...


These are freakish data.

How to compute 10 "equivalent" groups ?
For example with closed parameters means between groups :

Group   RGmean      RWmean      Glymean
1     1.5               1.22              1.68
2     1.3         1.29              1.75
3           1.6               1.25              1.63
4     1.2               1.23              1.70
...   ...               ...               ...


Best regards.

Alexandre MENICACCI
Bioinformatics - FOURNIER PHARMA
50, rue de Dijon - 21121 Daix - FRANCE
a.menicacci@fr.fournierpharma.com
tÚl : 03.80.44.76.17



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