PCA
Dear Sami, if the similarity matrix is based on euclidean distances of original data, then principal coordinate analysis (e.g. cmdscale in R) on this distance matrix should return the same result as would principal correspondence analysis on primary data. David 2012/3/3 Sami Rabei <samirabei at mans.edu.eg>:
Dear All If I have a similarity matrix, It is possible to have a PCA (Principal component for it. Sami Rabei http://mansoura.academia.edu/SamiRabei ---------------------------------- With my Best Wishes Sami Hussein Rabei, Ph.D. Botany Department Faculty of Science at Damietta New Damietta , Post Box 34517 Damietta Egypt . Tel. Mobile: ?002 0127 3601618 Tel. Work: ? ?002 057 2403981 Tel. Home: ? ?002 057 2403108 Fax: ? ? ? ? ?002 057 2403868
_______________________________________________ R-sig-ecology mailing list R-sig-ecology at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
------------------------------------------------------------------------------------ David Zeleny Department of Botany and Zoology, Masaryk University Kotlarska 2, 611 37 Brno Czech Republic email: zeleny at sci.muni.cz URL: http://www.sci.muni.cz/botany/zeleny/english.php