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openstars
2003 Jan 03
4
factor analysis (pca): how to get the 'communalities'?
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2. My try of a pca with R.
## My R input was:
m
cor(m)
library(mva)
m.pca<-princomp(m,cor=T)
m.pca
summary(m.pca)
loadings(m.pca)
m.pca$scores
m.FA <- factanal(factors = 3, covmat=cov(m))
m.FA
3. Here are my questions.
Q1.
The cor(m)-Matrix is the same as reported by using SPSS (or OpenStats2).
But in R I get other eigenvalues compared with the following SPSS output:
Original matrix trace = 10,00
Roots (Eigenvalues) Extracted:
1 5,052
2 1,771
3 1,427
4 0,819
5 0,430
6 0,247
7 0,159
8 0,062
9 0,029
10 0,003
- What is going behind the scene?
- O...