I hope that someone can help clarify some interesting output I came across from a Factor Analysis that I just conducted. I have a 24item instrument that I used Principal Axis Factoring for. By default, SPSS suggested that there were 5 factors based on the eigenvalue greater than 1 rule. I then tried to run the same procedure but altered the number of factors to be extracted to 3. The eigenvalues for the 3factor solution were not the same values as the first 3 eigenvalues from the 5factor solution (all values are based on prerotation). The values are close but shouldn't they be identical given that factors are extracted ortogonally? Thanks!
Kris
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