Which Method?

Orthogonal vs Oblique

Orthogonal and oblique rotations will produce virtually identical solutions in the case where factors are perfectly uncorrelated. As the correlation between latent variables diverges from r = 0.00, the oblique solution will produce increasingly clearer rotated factor patterns.
Using the following syntax, we can try each type of rotation on the engineering data and output a plot of the rotated factor loadings from the pattern matrix. We use ODS to plot the results, and request the plots of the factor loadings by including the PLOTS = LOADINGS option on the FACTOR statement.
ods graphics on/ width = 4in height = 6in; proc factor data = engdata nfactors = 2 method = prinit priors = SMC rotate = VARIMAX plots ...

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