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Re: st: Observations that keep a feature in the whole sample period


From   "Miguel Angel Duran Munoz" <maduran@uma.es>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Observations that keep a feature in the whole sample period
Date   Wed, 22 May 2013 00:16:30 +0200 (CEST)

Thanks, Nick. I guess you mean -keep- instead of -drop-. Nevertheless, the
command that you suggest would not guarantee that I keep the agents that
have been above the threhsold for the whole sample period (ie, I would be
including agents that were above the threshold in the first period and
then might have been above or below it).

> Sounds like
>
> bysort entity (const_a) : drop if const_a[1] > 0.09716
>
> Nick
> njcoxstata@gmail.com
>
> On 21 May 2013 23:01, Miguel Angel Duran Munoz <maduran@uma.es> wrote:
>> Hi, Statalisters. I want to focus on agents in my dataset that have a
>> particular feature; specifically, for those agents, and for each and
>> every
>> period (out of 64), the value of a variable (const_a) is larger than a
>> particular threshold (0.097116). I have done what I show below.
>> Nevertheless, I have realized that some of my agents are not in the
>> sample
>> since the first period, so what I am doing would mistakenly eliminate
>> them. Will anyone help to solve this problem? Thanks in advance.
>>
>> bysort entity (date2): gen obs=_n
>> drop if const_a<0.097116
>> by entity: drop if obs[_N]<64
>>
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