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Re: st: Generate combined with if
From
Nick Cox <[email protected]>
To
[email protected]
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
<[email protected]> 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 <[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()-.
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