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Re: st: Generate combined with if
From
Katia Bobulova <[email protected]>
To
[email protected]
Subject
Re: st: Generate combined with if
Date
Wed, 10 Aug 2011 16:23:36 +0100
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.
Thanks,
Katia
2011/8/10 Maarten Buis <[email protected]>:
> 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()-.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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