Do I need to combine grouped items from principal component analysis (PCA) before running a regression analysis?

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Anders Björk

Normally ones does principal component regression on the PCA-scores as X-variables. Or did you see PCA only as exploratory analysis before regression on the raw-data itself?

Leonardo Mataruna

It depends on the objectcive of your research. However, variables will be uncorrelated so may differentiate better among the two groups when doing logistics regression.