Displaying 1 result from an estimated 1 matches for "tp3923138p3923397".
2011 Oct 20
2
Aggregating data help
Hello,
I have a dataset with student performance on a math test. There are
multiple cases for each student (identified by id) and the concept as a
variable.
> rtest
id test subject grade concept correct tested per_corr
year
1 1 83 Mathema 8 8.2.D 1 1 100
2011
2 1 83 Mathema 8 8.3.A 1 2