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Re: st: RE: generate new variables using the first record of the group
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
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
[email protected]
On 29 October 2013 23:53, Song, Lin <[email protected]> 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: [email protected] [mailto:[email protected]] On Behalf Of Nick Cox
> Sent: Tuesday, October 29, 2013 4:25 PM
> To: [email protected]
> 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
> [email protected]
>
>
> On 29 October 2013 22:49, Sergiy Radyakin <[email protected]> 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 <[email protected]> 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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