st: Creating dummy variables

[Anup Nandialath <nandialath.anup@gmail.com>]

Dear Statalisters,

I have a question with respect to creating dummy variables.

First, I tabulate data based on a specific condition

tab group if A==1

and the Stata and example output (partial) looks as follows


 Group   |      Freq.     Percent        Cum.
-----------------------------------+----------
 Group 1 |         34        4.34        4.34
 Group 2 |         10        1.28        5.62
 Group 3 |         22        2.81        8.43
 Group 4 |         35        4.47       13.15
 Group 5 |         14        1.79       14.94
-----------------------------------------+---

In my dataset I have more than 30 groups (of which only some meet the
required condition). Therefore my task is to create a dummy variable
which will take the value of 1 if it belongs to any of the groups
which are listed as output from the conditional table and zero
otherwise.

Any help in this direction is much appreciated.

Thanks

Anup
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