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Re: st: Generating dummy variables based on two categories..


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generating dummy variables based on two categories..
Date   Wed, 30 Jan 2013 15:21:12 -0500

make the two into one variable using -egen- with the "group" function:

egen newvar=group(oldvar1 oldvar2)

you can then use either -tabulate- with the gen option or you can use
factor variable notation (see -h fvvarlist-)

Rich

On 1/30/13 3:16 PM, Mukund Chari wrote:
> Dear Stata-listers,
> 
> I am trying to generate dummy variables based on two variables with multiple categories in each.
> The dummies need to represent each unique combination of the two variables.
> 
> UserID   Techlab               UserTechD1       UserTechD12     UserTechD13     UserTechD14     UserTechD15     UserTechD6                UserTechD7       UserTechD8       
>                                                 (Comb: 11)          (Comb: 21)          (Comb: 22)          (Comb: 23)          (Comb: 31)          (Comb: 32)                (Comb: 43)          (Comb: 51)          
> 1              1                              1                              0                              0                              0                              0                              0                              0                              0              
> 2              1                              0                              1                              0                              0                              0                              0                              0                              0
> 2              2                              0                              0                              1                              0                              0                              0                              0                              0
> 2              3                              0                              0                              0                              1                              0                              0                              0                              0
> 3              1                              0                              0                              0                              0                              1                              0                              0                              0
> 3              2                              0                              0                              0                              0                              0                              1                              0                              0
> 4              3                              0                              0                              0                              0                              0                              0                              1                              0
> 4              3                              0                              0                              0                              0                              0                              0                              1                              0
> 5              1                              0                              0                              0                              0                              0                              0                              0                              1
> 
> The tabulate: generate command uses only a single variable to create the dummies; not sure what to do when there are multiple variables.
> 
> Any help is most appreciated.
> 
> Best,
> Mukund.
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