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Re: st: Generate combined with if


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Generate combined with if
Date   Wed, 10 Aug 2011 16:30:08 +0100

I guess subscripting provides at least part of the answer, e.g. [_n -
lag1], [_n + lag2].

To get better answers, you need to tell us much more about your data.

Nick

On Wed, Aug 10, 2011 at 4:23 PM, Katia Bobulova
<katia.bobulova@googlemail.com> wrote:

> I want just to do regressions for different time intervals (identified
> by id) and the dependent variable should be the price 30min later
> (id=10) and 5minutes before (id=3) the event happen.
>
> cond doesn't seem to be the solution.

> 2011/8/10 Maarten Buis <maartenlbuis@gmail.com>:
>> On Wed, Aug 10, 2011 at 4:48 PM, Katia Bobulova wrote:
>>> I would like to construct this new price, given by the combination of
>>> other prices when there is a particular id.
>>>
>>> I typed:
>>>
>>> by date: gen p=(price_b (if id==10) - price_b (if id==3))/ price_b (if id==3)
>>
>> This does not make sense to me, what should happen when id != 10 or
>> when id != 3?
>>
>> Anyhow, the syntax is not valid as you noticed. Consider looking at
>> -help cond()-.
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