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
>
> ______________________________________________
> [email protected] mailing list
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> 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)
--
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