Principal Component Analysis

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nurlaila ismail
nurlaila ismail 2012-2-21
Hi there,
I want to find significant chemical compound from 7*64 matrix of data, so that i can do classification using only those significant only. I normalized it first using zscore (range -2 to 2.5), then i apply PCA to reduce the data. I got coeff (64*64), score(7*64), latent(64*1), explained variance (bargragph of 5components), eigenvalues(64*64), eigenvectors(64*64), etc. however, i still dont know what is my significant chemical compound? is that the score value?or, how can i find which one in the original data (7*64) that has been chosen as the last output as principal component ?
Many thanks
Laila

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Richard Willey
Richard Willey 2012-2-21
The Statistics Toolbox product page has a good demo titled "Partial Least Squares Regression and Principal Components Regression"
http://www.mathworks.com/products/statistics/demos.html?file=/products/demos/shipping/stats/plspcrdemo.html
You should be able to modify this example pretty easily...

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