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Re: st: Stata analog to Mata's -strdup()- or better approach?


From   [email protected] (Brendan Halpin)
To   [email protected]
Subject   Re: st: Stata analog to Mata's -strdup()- or better approach?
Date   Fri, 11 Mar 2011 18:51:28 +0000

On Fri, Mar 11 2011, Rebecca Pope wrote:

> patid     estring
> 1          XXXXX-------
> 2          --XXX---XXXX
> 3          -XXXXXX-----
> 4          -XXX-XXX-XXX
>
> I need to find first the longest period of continuous eligibility
> (i.e. the longest set of Xs) and when that period occurred.

Why not convert to a more natural format for Stata?

+-------------------------------------------------------------------
input id str12 estring
1          XXXXX-------
2          --XXX---XXXX
3          -XXXXXX-----
4          -XXX-XXX-XXX
end

forvalues x = 1/12 {
  gen e`x' = substr(estring,`x',1)=="X"
}

reshape long e, i(id) j(month)

gen episode = 1
by id: replace episode = episode[_n-1] + (e!=e[_n-1]) if _n>1

sort id episode month
by id episode: gen eplen = _N
+-------------------------------------------------------------------

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147
mailto:[email protected]  http://www.ul.ie/sociology/brendan.halpin.html
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