Answers are grounded in this paper and cite their sources.
For the case of two or more groups of variables (batteries), generalizations on three common factor models, the Equal Residual Variances model, the Image model of Jöreskog, and the Canonical Factor Analysis model, are described and illustrated with empirical examples.
No takes yet. Share an insight, caveat, or question.
Roderick P. McDonald (1970) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: