Thanks very much!
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Daniel Egan
Sent: Wednesday, January 19, 2005 3:04 PM
To: [email protected]
Subject: Re: st: Data management problem: unique combinations
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 -egen...group()-
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.
Cheers,
Dan
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