All factor analysis methods constrain the factors to be uncorrelated.

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Factor analysis methods can be divided into two main types: exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). In EFA, factors can be either correlated or uncorrelated, depending on the rotation method used (orthogonal rotations assume uncorrelated factors, while oblique rotations allow for correlated factors). CFA, on the other hand, can explicitly model factors to be correlated if specified by the researcher.

All Factor Analysis Methods Constrain the Factors to Be Uncorrelated