I am trying to perform factor analysis using SPSS, varimax. But the Rotation failed and come up this message:"Rotation failed to converge in 25 iterations. (Convergence = .001)." Why this happened?
Can i increase the number of iterations to 50?
You may also want to check whether the way you are conducting the analysis is congruent with your assumptions (e.g., varimax assumes uncorrelated factors). I found this paper very helpful:
Costello, A. B., & Osborne, J. W. Best Practices in Exploratory Factor Analysis: Four Recommendations for Getting the Most From Your Analysis. Practical Assessment Research & Evaluation, 10(7), 2.
Available here: http://pareonline.net/getvn.asp?v=10&n=7
Dear Iftikhar,
Yes, try incresing the number of iterations.
Best,
Ruben.
You may also want to check whether the way you are conducting the analysis is congruent with your assumptions (e.g., varimax assumes uncorrelated factors). I found this paper very helpful:
Costello, A. B., & Osborne, J. W. Best Practices in Exploratory Factor Analysis: Four Recommendations for Getting the Most From Your Analysis. Practical Assessment Research & Evaluation, 10(7), 2.
Available here: http://pareonline.net/getvn.asp?v=10&n=7
Thanks All
I had increased the maximum number of iterations from 25 to 50 in spss and the rotated component matrix comes out.
You may have a Heywood case, in which you are overextracting
the number of factors. Or you may have a singular correlation matrix.
SPSS probably doesn't know how to apply a Monroe Penrose inverse
to such a problem.
I would definitely review and apply the Costello paper referenced above to make sure you have the best fit. Costello paper offers excellent guidance. After you determine your factors, be sure to check the correlations for each scale to get the inter-item, item to total score, and Cronbach's alpha coefficients. They should be in the range of 0.80 or better to be good scales.
A Good question and A good answer!
Especially introduced article by Heiko Breitsohl was so useful.
Thanks
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