Re: [R] Problem with PCA

From: Richard Rowe <richard.rowe_at_jcu.edu.au>
Date: Mon, 03 Mar 2008 15:38:30 +1000

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

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Received on Mon 03 Mar 2008 - 05:41:55 GMT

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