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Re: st: RE: generate new variables using the first record of the group


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: generate new variables using the first record of the group
Date   Wed, 30 Oct 2013 00:29:14 +0000

The same answer and the same question. To get your -city_1- and
-city_2- it is sufficient (although not necessary) to use any value of
-city- that is equal to 30 or 12 respectively.

But why do you want to do this?
Nick
njcoxstata@gmail.com


On 29 October 2013 23:53, Song, Lin <Lin.Song@kingcounty.gov> wrote:
> Thanks Sergiy and Nick.  Sergiy told me a command that I did not know.
>
> On the other hand, I did not ask my question clearly.  I was actually thinking something like the question below:
>
> For the following dataset , I'd like to generate two new variables in the last two columns (city1_n and city2_n) as shown below based on the first three columns.  I thought I could use egen.
>
> id      city    city_n  city1_n city2_n
> 1       1       30      30      12
> 2       1       30      30      12
> 3       1       30      30      12
> 4       2       12      30      12
> 5       2       12      30      12
> 6       2       12      30      12
> 7       2       12      30      12
> 8       .               30      12
> 9       .               30      12
> 10      .               30      12
>
> Thanks.
>
> Lin
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Tuesday, October 29, 2013 4:25 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: generate new variables using the first record of the group
>
> Sergiy's answer is perfect, naturally, but quite why you would want to do this remains open. For some graphical purposes, a constant variable can be useful, but otherwise a constant is often better stored in a scalar or local.
>
> Nick
> njcoxstata@gmail.com
>
>
> On 29 October 2013 22:49, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
>> Lin, use the square brackets to address the particular observation of
>> a variable:
>>
>> sysuse auto
>> generate newvar=price[7]
>>
>> Creates a variable newvar, which is equal to the 7th observation of
>> existing variable price.
>>
>> Best, Sergiy Radyakin
>>
>>
>> On Tue, Oct 29, 2013 at 6:02 PM, Song, Lin <Lin.Song@kingcounty.gov> wrote:
>>> Dear Stata users?
>>>
>>> How do I generate a new variable with its value for all observations equals to the first observation or the nth observation of another variable?
>>>
>>> Thanks.
>>>
>>> Lin
>>>
>>>
>>>
>>>
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