A new look at Horn's parallel analysis with ordinal variables.

@article{Garrido2013ANL,
  title={A new look at Horn's parallel analysis with ordinal variables.},
  author={Luis Eduardo Garrido and Francisco Jos{\'e} Abad and Vicente Ponsoda},
  journal={Psychological methods},
  year={2013},
  volume={18 4},
  pages={
          454-74
        }
}
Previous research evaluating the performance of Horn's parallel analysis (PA) factor retention method with ordinal variables has produced unexpected findings. Specifically, PA with Pearson correlations has performed as well as or better than PA with the more theoretically appropriate polychoric correlations. Seeking to clarify these findings, the current study employed a more comprehensive simulation study that included the systematic manipulation of 7 factors related to the data (sample size… 

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