[R] contingency table, several variables from dataframe

[Birgitle]

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
> 
> ______________________________________________
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> 
> 


-----
The art of living is more like wrestling than dancing.
(Marcus Aurelius)
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