Re: st: Dummy variable transformation replacing missing data

[Ronnie Babigumira <rb.glists@gmail.com>]

This might be helpful

http://www.stata.com/support/faqs/data/missing.html 

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010100100110111101101110011011100110100101100101




On Monday, June 11, 2012 at 2:54 PM, Joe Dreyfus wrote:

> Hi Statalist,
> 
> I have the following data.
> 
> id 
> t
> x
> z
> y
> 
> 1
> 1
> 1
> .
> .
> .
> 
> 2
> 1
> 2
> 1
> 0
> 0
> 
> 3
> 1
> 3
> .
> .
> .
> 
> 
> 
> 
> 
> 
> 
> 
> 4
> 2
> 1
> 0
> 1
> 0
> 
> 5
> 2
> 2
> .
> .
> .
> 
> 6
> 2
> 3
> .
> .
> .
> 
> 7
> 2
> 4
> .
> .
> .
> 
> 8
> 2
> 5
> .
> .
> .
> 
> 
> 
> 
> 
> 
> 
> 
> 9
> 3
> 1
> .
> .
> .
> 
> 10
> 3
> 2
> 0
> 0
> 1
> 
> 11
> 3
> 3
> .
> .
> .
> 
> 12
> 3
> 4
> .
> .
> .
> 
> 13
> 3
> 5
> .
> .
> .
> 
> 14
> 3
> 6
> .
> .
> .
> 
> 
> 
> 
> 
> And would like to transform the data as follows:
> 
> id 
> t
> x
> z
> y
> x'
> z'
> y'
> 
> 1
> 1
> 1
> .
> .
> .
> 1
> 0
> 0
> 
> 2
> 1
> 2
> 1
> 0
> 0
> 1
> 0
> 0
> 
> 3
> 1
> 3
> .
> .
> .
> 1
> 0
> 0
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 4
> 2
> 1
> 0
> 1
> 0
> 0
> 1
> 0
> 
> 5
> 2
> 2
> .
> .
> .
> 0
> 1
> 0
> 
> 6
> 2
> 3
> .
> .
> .
> 0
> 1
> 0
> 
> 7
> 2
> 4
> .
> .
> .
> 0
> 1
> 0
> 
> 8
> 2
> 5
> .
> .
> .
> 0
> 1
> 0
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 9
> 3
> 1
> .
> .
> .
> 1
> 0
> 1
> 
> 10
> 3
> 2
> 0
> 0
> 1
> 1
> 0
> 1
> 
> 11
> 3
> 3
> .
> .
> .
> 1
> 0
> 1
> 
> 12
> 3
> 4
> .
> .
> .
> 1
> 0
> 1
> 
> 13
> 3
> 5
> .
> .
> .
> 1
> 0
> 1
> 
> 14
> 3
> 6
> .
> .
> .
> 1
> 0
> 1
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> The time period where the indicator is on is not relevant. I just need to know how to transform the variable so that if it is swtiched on in one time period it is transformed to be switched on for all time periods. 
> 
> 
> Thanks in advance!
> 
> Joe 


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