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Statistical Methods in Medical Research
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Principal component analysis and exploratory factor analysis

IT Joliffe

Department of Mathematical Sciences, University of Aberdeen

Bjt Morgan

Institute of Mathematics and Statistics, University of Kent

In this paper we compare and contrast the objectives of principal component analysis and exploratory factor analysis. This is done through consideration of nine examples. Basic theory is presented in appendices. As well as covering the standard material, we also describe a number of recent developments. As an alternative to factor analysis, it is pointed out that in some cases it may be useful to rotate certain principal components if and when that is appropriate.

Statistical Methods in Medical Research, Vol. 1, No. 1, 69-95 (1992)
DOI: 10.1177/096228029200100105
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