JFRI (Jesper Frickmann) wrote:
I want a list of the number of times some factor levels appear together,
Say a and b are the names of the factors:
table(a,b)
table(a:b)
aggregate(a,list(a=a,b=b),length)
Christophe Pallier
http://www.pallier.org
__
You might want to look at ?table and ?xtab. See also ?tapply for use of
general functions (other than just COUNT) with GROUP BY.
HTH,
Vadim
-Original Message-
From: JFRI (Jesper Frickmann) [mailto:[EMAIL PROTECTED]
Sent: Friday, April 02, 2004 1:06 PM
To: [EMAIL PROTECTED]
Subject:
Assuming you have a data.frame, dat, with coluns A and B, I think what you
want would be:
table(paste(dat$A,dat$B))
JFRI (Jesper Frickmann) wrote:
I want a list of the number of times some factor levels appear together,
similar to the following SQL statement:
SELECT A, B, COUNT(C) FROM TBL
