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# Re: st: generate a new categorical variable

 From urbain thierry YOGO To statalist@hsphsun2.harvard.edu Subject Re: st: generate a new categorical variable Date Thu, 13 Sep 2012 21:37:02 +0100

```Thank you very much. I really appreciate

2012/9/13, Steve Nakoneshny <scnakone@ucalgary.ca>:
> 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*
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

--
*Urbain Thierry YOGO
Ph.D candidate in Economics*
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```