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fpiston (1) [Avatar] Offline
#1
In the chapter 14 "Principal components and factor analysis" page 380 in the section "1. Prepare de data" you said that we can to use raw data or we can to use raw data or correlation matrix, but it is not said if we need to scale the data when we had not the data in the same unit. Have we to scale them in order to give the same influence to each one? Is it necessary a reliability test for the data?


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