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Gottfried Helms
  • Member for 11 years, 6 months
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526 votes
3 answers
390k views

Relationship between SVD and PCA. How to use SVD to perform PCA?

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128 votes
28 answers
43k views

Free statistical textbooks

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26 votes
1 answer
9k views

What exactly is called "principal component" in PCA?

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14 votes
3 answers
23k views

What are the assumptions of factor analysis?

  • 313
12 votes
2 answers
15k views

Factor rotation methods (varimax, oblimin, etc.) - what do the names mean and what do the methods do?

10 votes
1 answer
52k views

Which matrix should be interpreted in factor analysis: pattern matrix or structure matrix?

  • 123
10 votes
1 answer
6k views

What is the relationship between scale reliability measures (Cronbach's alpha etc.) and component/factor loadings?

  • 101
9 votes
4 answers
9k views

Very different results of principal component analysis in SPSS and Stata after rotation

  • 93
6 votes
1 answer
665 views

What is the value of linear dimensionality reduction in the presence of nonlinear alternatives?

  • 235
3 votes
4 answers
22k views

"matrix is not positive definite" - even when highly correlated variables are removed