R help - Aug 2007 - a problem with the varimax() fonction (stat package)

Hi,I am puzzled with different results in R, compared to SPSS and Senstools.Net.
After running a PCA on the three software (for R, I use the PCA function
programmed on the FactoMineR package), I extracted the loadings. In the three
cases, the loadings are exactly identical.Then, I applied the varimax rotation
on these loadings, and unfortunately, the results differ. A quick look at the
resulting rotation matrix (rotmat) shows me, that the results are
"sorted" differently. Here are my results for the rotation matrix:On
R: > complet.varimax <- varimax(complet.loadings,normalize=T)$rotmat>
complet.varimax      [,1]    [,2]    [,3]    [,4]   [,5]   [,6]   [,7]  
[,8][1,]  0.529  -0.034  -0.411  -0.428  0.013 -0.297 -0.399  0.344[2,] -0.119  
0.715  -0.194  -0.058  0.517 -0.219 -0.068 -0.337[3,]  0.081   0.087   0.722 
-0.017  0.250 -0.472  0.092  0.413[4,]  0.110   0.039  -0.172   0.860  0.139
-0.013 -0.343  0.284[5,] -0.159  -0.353  -0.419   0.010  0.502 -0.114  0.578 
0.275[6,] -0.122  -0.065   0.184  -0.240  0.502  0.670 -0.357  0.248[7,]  0.612 
0.409   0.026   0.070 -0.061  0.420  0.497  0.159[8,] -0.522   0.427  -0.181 
-0.107 -0.379  0.043  0.042  0.595On SPSS and Senstools.Net:Rotation     dim 1  
dim 2    dim 3    dim 4    dim 5    dim 6    dim 7    dim 8dim 1        -0,53   
-0,41    -0,43    -0,40     0,03    -0,34    -0,30    -0,01dim 2         0,12   
-0,19    -0,06    -0,07    -0,71     0,34    -0,22    -0,52dim 3        -0,08   
0,72    -0,02     0,09    -0,09    -0,41    -0,47    -0,25dim 4        -0,11   
-0,17     0,86    -0,34    -0,04    -0,28    -0,01    -0,14dim 5         0,16   
-0,42     0,01     0,58     0,35    -0,27    -0,11    -0,50dim 6         0,12   
0,18    -0,24    -0,36     0,07    -0,25     0,67    -0,50dim 7         0,61   
-0,03    -0,07    -0,50     0,41     0,16    -0,42    -0,06dim 8        -0,52   
0,18     0,11    -0,04     0,43     0,60    -0,04    -0,38 Here, we can clearly
see, that the results are similar, but sorted differently (in R, the second
column correspond to the 5th column in SPSS or Senstools.Net).Concerning the
loadings after rotation, the results are different to (permutation are seen
too).Please, could someone explain me what''s happening?Personally, I
have the feeling that the results differ...is it true? Which results should I
trust?Should you need any further information for answering me, do not hesitate
to contact me (thierryworch@hotmail.com).I look forward to your response.Best
regards, WORCH Thierry
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