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Re: st: Data management problem: unique combinations

From   Daniel Egan <[email protected]>
To   [email protected]
Subject   Re: st: Data management problem: unique combinations
Date   Wed, 19 Jan 2005 18:04:01 -0500

Ritesh Asked:

> I need help with a data management problem. What is an efficient way of
> creating a categorical variable which consists of all unique
> combinations of a series of indicators variables?
> For example, I have a data set with five binary variables: var1, var2,
> var3, var4 and var5. A new variable is needed in which the categories
> represent all possible unique combinations of var1-var5.

this is the vocation of

to use the resulting variable as a categorical, combine it with -xi-

for example:
egen combo=group(var1 var2 var3 var4 var5)
xi i.combo

Also see  -fillin- if you would like to create all possible
combinations, not just the ones that occur within the data.

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