[R] data frame to frequencies

[R. Michael Weylandt]

I think you're looking for xtabs [see the examples; they're quite
good] but I can't be sure: your printed object can't really exist in R
so I'm not sure what you have currently.

Michael

On Wed, May 30, 2012 at 3:25 PM, cassiorx <cassiodorus at hotmail.com> wrote:
> 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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