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course_code
2010 Feb 10
1
Count variables by ID
Hello,
I have an education dataset and I'd like to know how to count the number of
courses each student has taken in a particular subject. For instance, say
the course codes for "History" are 20-26 & 31 and I have the following data
Student ID Course Code
1 16
1 17
1 21
1 31
2 10
2