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Re: st: Obtain information from nearest observation

From   Jeph Herrin <>
Subject   Re: st: Obtain information from nearest observation
Date   Fri, 07 Sep 2012 14:36:07 -0400

********* this should do it **************************************
u datasetA, clear
gen byte event=1
merge 1:m COMPANY using datasetB, keepusing(DATE NET_SALES)
drop if _merge==2
bysort COMPANY (DATE) : egen last_sales=NET_SALES[_n-1] if event==1
bysort COMPANY (DATE) : egen next_sales=NET_SALES[_n+1] if event==1

On 9/7/2012 11:54 AM, "Marco Müller" wrote:
Hi all

I have the following problem: I have a dataset A with event dates for firms as:
1          01/03/1986
2          15/08/2001

and I have a dataset B with financial information about the firms, e.g.:
COMPANY     DATE             NET_SALES
1           31/12/1985       1'000
1           31/12/1986       2'000
1           31/12/1987       1'200
2           30/06/2000         400
2           30/06/2001         600
2           30/06/2002         700

I'd like to obtain the last available net sales information PRIOR to the event date (or, in another case, the first one FOLLOWING the event date). For example, I'd like to obtain the net sales of 1'000 and 600 for A and B (prior to the events) and 2'000&700 following the events.

Any suggenstions how to handle that?

Many thanks for your suggestions

Best regards,
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