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Re: st: generate a new categorical variable


From   Steve Nakoneshny <scnakone@ucalgary.ca>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: generate a new categorical variable
Date   Thu, 13 Sep 2012 14:21:58 -0600

Alternatively, you could achieve the same result via -encode-.

encode Z if Y==1, gen(X)
replace X=0 if Y==0

Steve

On 2012-09-13, at 1:53 PM, urbain thierry YOGO wrote:

> Dear all
> i have two variables Y and Z. Y is a dummy variable which takes 1 if
> individual has access to water and 0 otherwise. Z is a categorical
> variable which has the following structure:
> Z=A if individual uses bleach to clean water
> Z=B if individual use a filter to clean water
> Z=C if individual use solar energy to clean water
> Z=D if individual use absorbent cotton to clean water
> 
> Here is my problem. I want to generate a new variable X which should
> be a combination of Y and Z. Here is the code i have written
> gen X=0 if Y==0
> replace X=1 if Y==1 & Z=="A"
> replace X=2 if Y==1 & Z=="B"
> replace X=3 if Y==1 & Z=="C"
> replace X=4 if Y==1 & Z=="D"
> 
> My concern is that when i write this code, the first two lines work,
> but after, there is 0 replacement. Please can somebody help me? Thank
> 
> -- 
> *Urbain Thierry YOGO
> Ph.D candidate in Economics*
> *
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