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rotating the reference axes of the factor solution to simplify the factor structure and to achieve a more meaningful and interpretable solution. The idea of simple structure has provided the most common basis for rotation, the goal being to rotate the factors simultaneously so as to have as many zero loadings on each factor as possible
ROTATE= option in the PROC FACTOR statement supports five orthogonal rotation methods: EQUAMAX, ORTHOMAX, QUARTIMAX, PARSIMAX, and VARIMAX
常用的是正交旋转和方差最大化旋转,旋转的目的是使得各个因子更加容易解释实际意义(factor loading 大的更接近于1,小的更趋于0),旋转落实到数据就是sin,cos的转化
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