[R] Problem with PCA

[Richard Rowe]

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

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