, Volume 35, Issue 1, pp 79–98 | Cite as

Longitudinal factor analysis

  • M. C. Corballis
  • R. E. Traub


A model is presented for factor analysing scores on a set of psychological tests administered as both pre- and postmeasures in a study of change. The model assumes that the same factors underlie the tests on each occasion, but that factor scores as well as factor loadings may change between occasions. Factors are defined to be orthogonal between as well as within occasions. A two-stage least squares procedure for fitting the model is described, and generally provides a unique rotation solution for the factors on each occasion.


Factor Loading Factor Score Correlation Matrice Orthogonal Rotation Testing Occasion 
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Copyright information

© Psychometric Society 1970

Authors and Affiliations

  • M. C. Corballis
    • 1
  • R. E. Traub
    • 2
  1. 1.Mcgill UniversityUSA
  2. 2.The Ontario Institute for Studies in EducationUSA

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