Hello,
I am new to R and I have a question about the difference between
correspondence analysis in R and SPSS.
This is the input table I am working with (4 products and 18 attributes):
> mytable
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 15 11 20 4 14 7 1 2 1 4 12 12 17 19 11 20 9 10
2 19 18 14 14 16 4 14 11 11 15 22 19 22 16 21 19 15 16
3 16 13 10 9 15 4 10 7 11 13 18 17 14 14 16 16 13 11
4 21 18 16 14 20 6 12 14 14 17 23 20 19 18 21 18 19 18
I found the function corresp() in the package MASS, but the results are
different from the output in SPSS. Also, I don't understand the coordinates;
in the biplot I cannot find a -2 limit for example from the first product on
any of the x axes.
> Rresult <- corresp(mytable, nf=2)
> Rresult
First canonical correlation(s): 0.20823373 0.04840434
Row scores:
[,1] [,2]
1 -2.0838424 0.01237391
2 0.4901559 1.51190922
3 0.4463375 -0.72631884
4 0.4946202 -0.87620237
Column scores:
[,1] [,2]
1 -0.29870621 -0.32282847
2 0.04851042 0.73570925
3 -1.79584803 0.04537505
4 1.10904141 1.21563470
5 -0.35048140 -1.28883782
6 -1.80044987 -1.99532989
7 1.96987033 1.89925225
8 1.59225423 -0.42249233
9 1.96534193 -2.01733348
10 1.29641406 -0.67857429
11 0.33216906 0.05071065
12 0.12620111 -0.30281237
13 -0.59997905 1.90985228
14 -1.18972391 -0.46697874
15 0.34099302 0.55835672
16 -1.07356465 0.44743219
17 0.32569239 -1.21741819
18 0.07133121 0.20777127
Thank you for your patience.
am
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