data frame to frequencies
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. -- View this message in context: http://r.789695.n4.nabble.com/data-frame-to-frequencies-tp4631859.html Sent from the R help mailing list archive at Nabble.com.
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