Factor analysis - select data?

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Factor analysis - select data?

Jonas-22
Do you know if i need to select data when performing a factor analysis?
That is, I have a large sample of people, and around 100 different criteria
for different diagnoses. 8 of these criteria make up one diagnosis, and 20
people have this diagnosis. When performing a factor analysis on these 8
criteria, do I only perform this on the 20 people or on everybody?