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Re: st: Using -exapand


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Using -exapand
Date   Thu, 23 May 2013 21:37:48 +0800

Thanks Nick and Tim,

Your tips solved the issue

Regards,
James

On Thu, May 23, 2013 at 9:29 PM, Tim Wade <wadetj@gmail.com> wrote:
> Is something like this what you are looking for?
>
> input id year n
> 1 1990 2
> 2 1945 5
> 3 1980 6
> end
>
> expand n
> bysort id: gen year2=year+_n-1
>
> Tim
>
>
> On Thu, May 23, 2013 at 8:31 AM, James Bernard <jamesstatalist@gmail.com> wrote:
>> Hi,
>>
>> I am trying to use -expand to replicate observations:
>>
>> Focalfirm   Technology  year        n
>> -------------    --------------   ---------   -------------
>>
>> Toyota  XYZ     1990    1
>> Toyota  XYZ             1991    4
>> Toyota  ZZZ             1990            --
>> VW      ABC     1999            2
>> VW      CDE     1998            3
>>
>>
>> The idea is that I want to repeat each observation n times. However,
>> the new observation must have an updated year number too. That is, the
>> second observation must be repeated 4 times (including the original
>> observation, of course), but the year must be updated. So, the next
>> observations would be identical to the original one, except that their
>> year will be 1992, 1993 and 1994.
>>
>> Using -expand,
>>
>> -expand n, generate(id)
>>
>> this is what I get
>>
>>
>> Focalfirm       Technology      year    n       id
>> Toyota  XYZ                    1990     1       0
>> Toyota  XYZ                    1991     4       0
>> Toyota  ZZZ                    1990             0
>> VW             ABC                     1999     2       0
>> VW             CDE                     1998     3       0
>> Toyota  XYZ                    1991     4       1
>> Toyota  XYZ                    1991     4       1
>> Toyota  XYZ                    1991     4       1
>> VW             ABC                     1999     2       1
>> VW            CDE                      1998     3       1
>> VW            CDE                      1998     3       1
>>
>>
>>
>> This is fine, except that the years are not updated. Any idea how I can do this?
>>
>> Thanks,
>> James
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