R help - May 2003 - how to handle 'multiresponse' variable?

Hello!

I have dataset where one variable is 'multiresponse', like this:
[1] "1 2" "1 2 3" "4" "1 4" "4
3" etc.
'responses' separated by space. observations in different 'rows'
of data.frame.
I can do strsplit(data$var,' ') and make a list, where multiple 
responses are elements of character vectors, like this:
  $ P124               :List of 2956
   ..$ : chr  "2" "4"
   ..$ : chr  "1" "2"
   ..$ : chr "NA"
   ..$ : chr  "3" "4"
   ..$ : chr "3"

I need to compute crosstabulation on this variable, to make 
crosstabulation where this variable is a factor variable 
(responses of this variable are categories, in which i need to 
compute distributions of other variables). And i need to do 
crosstabulation with 'weights', like in xtabs(w~f1+f2).

Is any way exists to do such things with 'multiresponse' variables 
in R or i need to write my own functions to handle it?

Thanks!

There were some discussions in the past on this subject.
AFAK, there're actually useful functions in Frank Harell's package
"hmisc", like mChoice() and summarize(). For the detail
go to the R search page

http://finzi.psych.upenn.edu/search.html

and search

"Frank Harrell type multi-valued variable".

--
Fan

Kosenkov Kirill wrote:
> Hello!
> 
> I have dataset where one variable is 'multiresponse', like this:
> [1] "1 2" "1 2 3" "4" "1 4" "4
3" etc.
> 'responses' separated by space. observations in different
'rows' of
> data.frame.
> I can do strsplit(data$var,' ') and make a list, where multiple 
> responses are elements of character vectors, like this:
>  $ P124               :List of 2956
>   ..$ : chr  "2" "4"
>   ..$ : chr  "1" "2"
>   ..$ : chr "NA"
>   ..$ : chr  "3" "4"
>   ..$ : chr "3"
> 
> I need to compute crosstabulation on this variable, to make 
> crosstabulation where this variable is a factor variable (responses of 
> this variable are categories, in which i need to compute distributions 
> of other variables). And i need to do crosstabulation with
'weights',
> like in xtabs(w~f1+f2).
> 
> Is any way exists to do such things with 'multiresponse' variables
in R
> or i need to write my own functions to handle it?
> 
> Thanks!
> 
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>