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Re: Re: st: Subtracting observations by group


From   AGAOGLU Enes <s1236623@sms.ed.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: Re: st: Subtracting observations by group
Date   Fri, 21 Jun 2013 15:03:56 +0000

Thank you Nick, I added that extra condition and I now have what I want.



On Fri, Jun 21, 2013 at 3:53 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> You said what you wanted, but you didn't say where to put it.
>
> Here's one way to approach it.
>
> bysort date (group) : gen price1M3 = price[1] - price[3]
>
> That way, the same difference will be repeated. You will want
> something more limited but that's just an extra condition.
> Nick
> njcoxstata@gmail.com
>
>
> On 21 June 2013 15:45, AGAOGLU Enes <s1236623@sms.ed.ac.uk> wrote:
>> Dear Stata-listers,
>>
>> I have the following dataset and I would like to subtract price by groups.
>>
>> date group price
>> 2010m1 1 10
>> 2010m2 1 15
>> 2010m3 1 12
>> 2010m1 2 9
>> 2010m2 2 21
>> 2010m3 2 15
>> 2010m1 3 8
>> 2010m2 3 20
>> 2010m3 3 16
>>
>> For instance, if I want to subtract group 1's prices from group 3's prices, the new variable should be the following:
>>
>> newvar
>> 2
>> -5
>> -4
>>
>> Since observations are in the same variable(price), I couldn't figure out how to do it. I tried to create a new variable only for group 1 and group 3, but then it looked like the following. Thus, I couldn't subtracted g1 from g3.
>>
>> g1 g3
>> 10 .
>> 15 .
>> 12 .
>> . 8
>> . 20
>> . 16
>>
>> Thank you in advance for any help,
>>
>> -Enes
>>
>>
>> --
>> The University of Edinburgh is a charitable body, registered in
>> Scotland, with registration number SC005336.
>>
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The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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