I need to find the number of groups in a larger group: the number of *sections
in a *course. Of course, I can do this:
sort course
by course: tabulate sections
One would then count the sections by eyeballing them in the tabulation, but
in my data, a course can have many many sections.
The conceptual idea would be analgous to this fantasy coding:
by course: codebook section
*
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