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Re: st: Assigning id's to other observations (after expanding)


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Assigning id's to other observations (after expanding)
Date   Tue, 19 Apr 2011 18:48:27 +0100

Not sure I follow this at all, but example code:

gen toexpand = id == parentid
expand 2 if toexpand
bysort parentid toexpand (id) : gen first = id[1]
by parentid toexpand (id) : gen last = id[_N]
by parentid : replace first = first[1]
by parentid : relace last = last[1]
by parentid : replace id = first if _n == _N - 1
by parentid : replace id = last if _n == _N



On Tue, Apr 19, 2011 at 6:24 PM, Ibarra-Caton, Marilyn
<marilyn.ibarra-caton@bea.gov> wrote:
> I am having a hard time with coding to get the data as I need it.  Any
> help would be greatly appreciated!!!
>
> My data looks like this:
>      id          Parent id
> 1.    Firm1   Firm3
> 2.    Firm1   Firm3
> 3.    Firm2   Firm3
> 4.    Firm3   Firm3
> In words what the data is telling me is that the parent id is the firm
> that absorbed the firm in the id column.  So in this case firm 3
> absorbed (merged with) firm 1 and firm 2.
>
> So I want the data to look like this:
>
> 1.    Firm1    Firm3
> 2.    Firm1    Firm3
> 3.    Firm2    Firm3
>
> 4.    Firm1    Firm3
> 5.    Firm2    Firm3
>
> So basically duplicate observation 4 and assign the id of observation 1
> & 2 to one of the duplicate observations and assign the id of
> observation 3 to the other duplicate observation.  For the observation
> that I am going to duplicate and assign a new id, it will always be the
> case that the id==parent id for this observation before any manipulation
> of the data.   I know that to duplicate observation 4 I can use the
> expand command.
>

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