RE: st: RE: pairwise dummy variables

[Serguei Kaniovski <kaniovsk@wifo.ac.at>]

Thank you, but this is not quite what I need. I would like to compute 
the frequencies of occurrence of all possible pairs of the binary 
variable "vote". To begin with, for example, generate variables "vote_*" 
for each possible pair of "voters_id", such that that, e.g., "vote_12" 
takes the value "1" if "voters_id" both have "vote=1", else zero, or NA 
if one of the voters in not on the body.

body_id,voter_id,vote,vote_12,vote_13,vote_17,vote_19,vote_23,vote_27,vote_29,vote_37,vote_39,...
1,1,1,0,1,1,0,0,0,0,1,0
1,2,0,0,1,1,0,0,0,0,1,0
1,3,1,0,1,1,0,0,0,0,1,0
1,7,1,0,1,1,0,0,0,0,1,0
1,9,0,0,1,1,0,0,0,0,1,0
2,1,1,0,.,0,.,.,0,.,.,.
2,2,0,0,.,0,.,.,0,.,.,.
2,7,0,0,.,0,.,.,0,.,.,.

and so on.

Serguei
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