i use factanal() to do factor analysis and get the factor score. and i want to do further analysis with the score and some varibles in the original data frame. but i don't know how to do it.i want to merge the 2 file into one.bu fail. maybe due to some missing value.the original data has 865 obs,but the score has 827obs.so i don't know how to do the further job. i want to scan the book MASS,but don't find the answer.