I need to test validity of measurement scales in my survey.
1) Is it true that both can be used to test measurement validity?
2) Or there are some types of validity that can be tested with EFA and some that - with CFA?
3) What is the best solution - which one should be used or both?
P.S. I have survey consisting of n-items (n-questions). Survey is related to consumer attitudes and behavior. The survey was constructed to measure 6 different constructs, each construct consist of different number of items (questions). I am writing a theoretical review of statistical methods that would be used to analyse the survey data. This is my first survey, I never did construct validity before, just read about it.