[R] how to analysis the factor score?

[ronggui]

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.