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


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generating dummy variables based on two categories..
Date   Wed, 30 Jan 2013 20:23:18 +0000

See e.g. the thread starting at

http://www.stata.com/statalist/archive/2012-10/msg00532.html

and its references.

Usage suggestions:

1. Indicator variable is a much better term than dummy variable.
2. Distinct is a much better word than unique.

Nick

On Wed, Jan 30, 2013 at 8:16 PM, Mukund Chari <mukundc@myuw.net> wrote:

> 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.

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