A FACTOR MODEL FOR ANALYSING CHANGE
Michael C. Corballis · British Journal of Mathematical and Statistical Psychology · 1973
This paper develops a model for factor analysing scores on n tests administered to N persons on p separate occasions. It allows factor scores and factor loadings to vary, but assumes the factors to be mutually orthogonal within, as well as between, all occasions. These assumptions are generally sufficient to specify unique rotations on each separate occasion. A worked example is given.