Dear All, I need to validate a new questionnaire made of 62 binary items. I have to perform EFA, defining reliability and implementing CFA. Unfortunately, I got a lot of missing values (80% of subjects have at least one missing answer) and I don't know how to deal with them. i don't think a listwise apporach could be a solution here, but should I impute those values before proceeding with EFA? If so, do you have any suggestions on which method(s) should I use in SAS? Many thanks in advance for your time and help, Giulia
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