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Re: st: How to record the first occurrence of the event?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to record the first occurrence of the event?
Date   Sun, 21 Oct 2012 11:04:52 +0100

Please show us some of your data, so that we do not have to imagine
what they look like.

Also, please see
http://www.stata.com/support/faqs/resources/statalist-faq/#spell

Nick

On Sun, Oct 21, 2012 at 10:58 AM, Roxannie Wankel <roxanniew@gmail.com> wrote:
> how to record the first occurrence of the event?
>
> A list of firms established one or several joint ventures in the
> period of 1990-2009. I need to record the first joint venture that a
> firm established witin three years.
>
> For example,
> Company A established a joint venture with Company B on Jan 5, 1991;
> (joint venture 1)
> Company A established another joint venture with Company C on Feb 9,
> 1993. (joint venture 2)
> Company A established the third joint venture with COmpany D on Dec 5,
> 1994. (joint venture 3)
> Company A establisehd the fourth joint venture with Company E on Dec
> 6, 2005 (joint venture 4)
>
> Then I have to record the first and the fourth joint venture.
> I should not record the second and the third one because the second
> one is within 3 years of the first one; and the third one is within 3
> years of the second one.
>
> How can I use the STATA command to record these two joint ventures?
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