search for: tp3923138p3923397

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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