Ok, then treat them as factors - but if they are really binary and coded
0 and 1, which kind of calculation would lead to different results for a
"factor" instead of a numeric variable?
Anyway,
ABC<-as.data.frame(cbind(A,B,C))
aggregate(ABC[,2:3],by=list(A),FUN=function(x)sum(x=='1')) # '1' is
here the level of the corresponding factor to be counted.
will work. A more sophisticated version could include some "factor to
numeric" conversion, see FAQ 7.10.
hth.
Birgitle schrieb:
Thanks for your answer.
It is intended, that the variables are treated as class factor, because
these are binary variables with, for example, the presence or the absence of
a plant organ.
As far as I understood, I have to treat them for other calculations as
factor. Therefore I classified these variables as factors in my original
dataframe.
If I do what you suggested, I have to change the classes of all my
variables. Is there a possibility to do something similar without changing
the classes?
B.
Eik Vettorazzi wrote:
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
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
-----
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
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
