'%EC%A7%91%EB%8B%A8%EB%B3%84%20%EC%B8%B5%ED%99%94%20%ED%91%9C%EB%B3%B8%20%EC%B6%94%EC%B6%9C%20dataframe%20%25%3E%25%20group_by%28factor_var%29%20%25%3E%25%20sample_n%28size%29'에 해당되는 글 0건