Gottfried Helms
  • Member for 11 years, 2 months
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3 answers
512 votes
364k views
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Relationship between SVD and PCA. How to use SVD to perform PCA?
28 answers
128 votes
43k views
175 bookmarks
Free statistical textbooks
1 answers
25 votes
8k views
14 bookmarks
What exactly is called "principal component" in PCA?
3 answers
14 votes
21k views
10 bookmarks
What are the assumptions of factor analysis?
2 answers
12 votes
14k views
8 bookmarks
Factor rotation methods (varimax, oblimin, etc.) - what do the names mean and what do the methods do?
1 answers
10 votes
50k views
6 bookmarks
Which matrix should be interpreted in factor analysis: pattern matrix or structure matrix?
1 answers
10 votes
6k views
2 bookmarks
What is the relationship between scale reliability measures (Cronbach's alpha etc.) and component/factor loadings?
4 answers
9 votes
9k views
1 bookmarks
Very different results of principal component analysis in SPSS and Stata after rotation
1 answers
6 votes
637 views
3 bookmarks
What is the value of linear dimensionality reduction in the presence of nonlinear alternatives?
4 answers
3 votes
21k views
2 bookmarks
"matrix is not positive definite" - even when highly correlated variables are removed