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st: Re: merge using interval data
try -findit nearmrg-
I wrote it for rounded value look ups. I haven't looked at the code in a
while, so it may not be as efficient as you need given the size of the
master dataset, but it could at least be a decent start on your problem.
----- Original Message -----
From: "Richard Goldstein" <firstname.lastname@example.org>
To: "statalist" <email@example.com>
Sent: Monday, October 25, 2004 8:38 AM
Subject: st: merge using interval data
> While I have an answer to my problem (see below), I wonder
> whether anyone has an idea for a more efficient procedure.
> The issue: I have two data sets, one large (gigabytes) with
> individual data including a unique id and a date of occurrence
> of a service being provided.
> I need the status of the provider on the date of occurrence
> for each case. I have a second data set that includes, for
> each provider their status as of a period of time (e.g.,
> a beginning and ending date for a contract).
> I need to merge the two so that the provider's status is
> included in the individual data set.
> The only solution I currently see involves expanding the
> provider data set so each possible data (from the beginning
> of the contract to the end) is covered and then merging the
> two data sets (using the nokeep option). However, this
> strikes me as inefficient.
> Any other suggestions would be greatly appreciated.
> Rich Goldstein
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