On May 30, 2012, at 4:51 PM, R. Michael Weylandt wrote:
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 <cassiodo...@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.
The R way? The "R way" would be to post directly to the mailing list
and avoid formatted input. Best practice would be to post the output
from dput(yourtable).
You can use merge() if you have two related tables.
--
David.
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______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius, MD
West Hartford, CT
______________________________________________
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