--- FUKUGAWA, N. wrote:
> 1 i made factor analysis and found proportion and eigenvalue of
> several factors were negative before rotation. cumulative proportion
> once exceeded 1 and then decreased to 0.
> 2 after rotation, i found cumulative proportion exceeded 1 and
> never be reduced.
> the data was standardized. i used commands "factor" and "rotate".
> is this problem of the data, programing, or stata's computation?
> thank you in advance.
To quote from the manual:
"Did you notice that the cumulative proportions of the eigenvalues
exceeded 1.0 in our factor analysis? This is due to the negative
eigenvalues. By default the proportions and cumulative proportions
columns are computed using the sum of all eigenvalues as the
divisor. The altdivisor option allows you to display the proportions
and cumulative proportions using the trace of the correlations
matrix as the divisor."
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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