PCA can also be used for compression http://www.willamette.edu/~gorr/classes/cs449/Unsupervised/pca.html http://www.willamette.edu/~gorr/classes/cs449/Unsuperv

PCA can also be used for compression http://www.willamette.edu/~gorr/classes/cs449/Unsupervised/pca.html http://www.willamette.edu/~gorr/classes/cs449/Unsupervised/p... Also worth noting is apache mahout supports PCA - you can perform this type of analysis on large matrices pretty easily these days