First of all your construction of ABC leads to a structure with 3 factor
variables due to the way cbind processes the input variables - which is
not intended I think.
You can do sth like
ABC<-data.frame(A,B,C)
aggregate(ABC[,2:3],by=list(A),sum)
hth.
Birgitle schrieb:
Hello R-Users!
I need a little help to build up a contingency table out of several
variables.
A<-c("F","M","M","F","F","F","F","M","F","M","F","F")
B<-c(0,0,0,0,0,0,1,1,1,1,0,1)
C<-c(0,1,1,1,1,1,1,1,1,0,0,0)
ABC<-as.data.frame(cbind(A,B,C))
ABC
A B C
1 F 0 0
2 M 0 1
3 M 0 1
4 F 0 1
5 F 0 1
6 F 0 1
7 F 1 1
8 M 1 1
9 F 1 1
10 M 1 0
11 F 0 0
12 F 1 0
I would like to count in each variable B and C the frequencies for M and F
(variable A) and finally get the following table:
B C
F 3 5
M 2 3
Is there a function that can do that in one step?
Tried ?structable, ?ftable, ?xtabs, ?table but could not get what I would
like to have.
Maybe I did not use the tried functions in the right way.
Many thanks in advance for any help.
B.
-----
The art of living is more like wrestling than dancing.
(Marcus Aurelius)
--
Eik Vettorazzi
Institut für Medizinische Biometrie und Epidemiologie
Universitätsklinikum Hamburg-Eppendorf
Martinistr. 52
20246 Hamburg
T ++49/40/42803-8243
F ++49/40/42803-7790
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