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2008 Sep 21
2
Variable Selection for data reduction and discriminant anlaysis
Hello all,
I'm dealing with geochemical analyses of some rocks.
If I use the full composition (31 elements or variables), I can get
reasonable separation of my 6 sources. Then when I go onto do LDA with the
6 groups, I get excellent separation.
I feel like I should be reducing the variables to thos that are providing
the most discrimination between the groups as this is important
2008 Sep 22
1
R-help Digest, Vol 67, Issue 23
...itional much of the time. R has a very good package for analysing this
data-type: see the compositions package (a new release seems iminent). You
will be able to get most of the main references from it. (The authors of the
package also have a newly-released article in one of the Elsevier journals
[unfor. my bib+ are elsewhere so I cannot give details]).
You could start by Wiki'ing your way to "compositional data".
HTH, Mark.
Gareth Campbell wrote:
>
> Hello all,
>
> I'm dealing with geochemical analyses of some rocks.
>
> If I use the full composition (3...