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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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