[Ifeffit] PCA component determination

[Santiago José Alejandro Figueroa]

Dear all,

Determine the number of components in Principal Component Analysis
decomposition is usually a hard work, close to an art. Recently Malinowski
discuss some methods in a paper that is proposed a new method (DRMAD):
DOI: 10.1002/cem.1182

This last method has in the program developed by Carmelo Prestipino
PCA_GUI.py (http://code.google.com/p/prestopronto/) developed with some
advices of Marcos Fernandez-Garcia.

There are many methods better than use the empirical IND funtion.
The better is have a good knowledge of your system by other techniques or
by the behavior, this additional information can be of the extreme
importance if you have more than 2 components.

Best regards,

Santiago
--------------------------------------------
Dr. Santiago J. A. Figueroa
Pesquisador - Laboratório Nacional de Luz Síncrotron (LNLS)
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