Good afternoon to everyone, I have this doubt. I designed for a thesis an instrument which has 20 items, the same one has been administered to 30 participants (total), my doubt comes from the side of validity. I would like to know if it is possible to apply the construct validity by factor analysis when you have such a small sample, because when I tried to do it with the SPSS and also with the FACTOR, it indicates that it is impossible. Thank you in advance for your kind attention and many greetings from Perú (South America).

PS: I attaches output from FACTOR.