This is a homework problem. I know how to do a PCA, you need to learn. I suggest you visit your textbook, then check the documentation for R's various PCA implementations to work out how to effect the analysis.
phthao05 wrote: > I have an exercise. With 3 kinds of yohourt a,b,c. There are 25 > participatients estimate 3 norms: taste (va,vb,vc), structure (ca,cb,cc) and > price (ga,gb,gc) and give the mark from 1 to 5. I don't know how to PCA this > data. Please help me! > I attached the data file follow: > Va Vb Vc Ca Cb Cc Ga Gb Gc > 4 2 4 5 5 5 4 4 2 > 2 2 4 3 2 5 4 5 1 > 2 2 1 2 3 3 3 1 4 > 1 1 2 2 3 3 4 3 2 > 3 4 4 4 3 1 2 1 2 > 1 1 1 1 2 4 3 2 4 > 4 4 2 2 2 1 2 1 3 > 2 3 3 3 4 3 1 1 1 > 4 5 1 3 3 2 4 2 4 > 2 2 5 1 1 3 2 3 3 > 4 2 4 5 3 3 4 4 4 > 3 4 2 1 2 2 1 2 4 > 1 2 1 2 3 3 3 1 4 > 3 4 1 1 2 1 2 3 3 > 5 4 3 4 3 1 1 1 2 > 4 4 2 2 2 1 4 2 4 > 2 2 1 1 2 4 3 2 4 > 3 1 3 4 2 5 3 4 1 > 1 1 2 2 3 3 4 3 2 > 2 3 4 3 4 4 4 3 1 > 2 3 3 3 4 3 1 1 1 > 4 3 1 1 1 2 2 3 3 > 1 1 1 1 2 4 3 2 4 > 3 4 2 1 2 2 3 1 3 > 3 4 2 1 2 2 1 2 4 > > -- Dr Richard Rowe Zoology & Tropical Ecology School of Marine & Tropical Biology James Cook University Townsville 4811 AUSTRALIA ph +61 7 47 81 4851 fax +61 7 47 25 1570 JCU has CRICOS Provider Code 00117J ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
