I have a data frame that has columns Semester, Student ID (SID), Subject,
Grade, Devel (Tor F). Students can have multiple records within a semester.
Right now, the columns are not considered factors.
I want to do an analysis that would show the number of students who received
particular combinations of grades. I also need to distinguish between the
two Development levels (they modify classes, not students), but first things
first.
Grade
Semester Count A B C D F other
S1 17 1 2 0 0 0 0
49 1 1 1 0 0 0
112 0 0 0 0 0 2
etc.
I can do this procedurally but that leads to a life of trouble and ugly
code. Your help deeply appreciated to do this in a r way.
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