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strnum
2007 May 06
1
intersect of 2 data frames
Greetings!
I am a new user of R. The only one in my department, all others use SPSS.
I have two data sets of students with test scores, pretest and
posttest. The first column StuNum and then columns of scores.
The problem is that the lists are slightly different not all students
are in both data sets.
So I did:
intersect(pretest$StuNum, posttest$StuNum) -> common.id
At this point I need to select from pretest the students in common.id
and do the same with posttest.
I h...