Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: RE: Keep first observation in such a dataset?
From
"Sarah Edgington" <[email protected]>
To
<[email protected]>
Subject
st: RE: Keep first observation in such a dataset?
Date
Tue, 11 Feb 2014 14:56:21 -0800
Peter,
I'm not sure I understand your data but it sound to me like maybe you want something as simple as:
keep if EVENT_DATE==DATE
If this isn't what you want, I think you'll probably need to explain in more detail what your full data set looks like and what additional rules you need to implement when selecting observations to keep.
-Sarah
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Peter Miller
Sent: Tuesday, February 11, 2014 1:39 PM
To: [email protected]
Subject: st: Keep first observation in such a dataset?
Hi guys,
this is my dataset:
DATE ID1 ID2 EVENT_DATE
8/13/2007 10147 95574 13aug2007
8/14/2007 10147 13aug2007
8/15/2007 10147 13aug2007
8/16/2007 10147 13aug2007
8/17/2007 10147 75645 13aug2007
8/20/2007 10147 13aug2007
..... ......
I want to keep only the first ID2. In the example, I want to keep 95574 only. Only the one, which is between DATE and EVENT_DATE. I want to drop all following ID2s in the time series. There are many different ID1s, but each ID1 belongs to only one single ID2, namely the one where EVENT_DATE==DATE.
How can I code this?
Thanks
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/