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Re: st: merge within a range


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: merge within a range
Date   Fri, 17 Sep 2010 08:44:53 -0400

thank you!

On 9/16/10 5:51 PM, Phil Schumm wrote:
> On Sep 16, 2010, at 3:55 PM, Richard Goldstein wrote:
>> I have the following merge problem. In one data set I have a start
>> date and and end date (and, of course, several other variables); in
>> another data set I have a particular date.  I want to merge the two
>> data sets with a match occurring if the "particular" date in data set
>> 2 is between (or equal) to the startdate/enddate in data set 1.
>>
>> An obvious kludge is to expand the first data set and fill-in the
>> dates to be consecutive.  If possible, however, I prefer not to do
>> this and am looking for any suggestions.
> 
> 
> Merge by all of the other variables first, and then just drop the
> resulting observations that don't meet your condition (i.e., for which
> the date is not between your start and end).  If the other variables
> together do not uniquely identify the observations in either file,
> you'll need to use -joinby- instead of -merge-.
> 
> 
> -- Phil
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