st: translation between binary system and the decimal system.

["Hans J. Baumgartner" <hbaumgartner@diw.de>]

Dear statalist,

I’ve got data that is binary coded. That is, an observation may belong 
to category 1, 2, 3 , 4 or a combination amongst these categories. My 
variable cat_id has the value of 1 1f it is in category 1; 2 if it is in 
category 2; 4 if it is in category 3; and 8 if it is in category 4. My 
variable has the sum of these values, i.e. cat_id=9 means that my 
observation is in category 1 and 4.

I would like to generate 4 dummies for a new category identification.

Cat_id Cat4 Cat3 Cat2 Cat1
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
...
10 1 0 1 0
11 0 0 1 1
...

i.e. it is a simple translation between binary system and the decimal 
system.
Is there a command for this?

Thanks

Hans

--
Hans J. Baumgartner DIW Berlin
German Institute for Economic Research
Dept. Public Economics
Königin-Luise-Str. 5; 14195 Berlin; Germany  
Tel.: +49/30/89789-307 
Fax.: +49/30/89789-114
http://www.diw.de
http://www.hansbaumgartner.de


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