PCA/Factor Node Rotation Options

In many cases, mathematically rotating the set of retained factors can increase their usefulness and especially their interpretability. Select a rotation method:

• No rotation. The default option. No rotation is used.
• Varimax. An orthogonal rotation method that minimizes the number of fields with high loadings on each factor. It simplifies the interpretation of the factors.
• Direct oblimin. A method for oblique (non-orthogonal) rotation. When Delta equals 0 (the default), solutions are oblique. As delta becomes more negative, the factors become less oblique. To override the default delta of 0, enter a number less than or equal to 0.8.
• Quartimax. An orthogonal method that minimizes the number of factors needed to explain each field. It simplifies the interpretation of the observed fields.
• Equamax. A rotation method that is a combination of the Varimax method, which simplifies the factors, and the Quartimax method, which simplifies the fields. The number of fields that load highly on a factor and the number of factors needed to explain a field are minimized.
• Promax. An oblique rotation, which enables factors to be correlated. It can be calculated more quickly than a direct oblimin rotation, so it can be useful for large datasets. Kappa controls the obliqueness of the solution (the extent to which factors can be correlated).