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Re: st: Keep observations in 1/100 by country and year


From   Estrella Gomez <estrellastata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Keep observations in 1/100 by country and year
Date   Fri, 10 May 2013 13:07:53 +0200

Thanks!

2013/5/7 Sergiy Radyakin <serjradyakin@gmail.com>:
> * * * * * * * * * Dear Estrella,
> the following code keeps top 3 earners for each group defined by
> occupation and marital status:
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> clear
> sysuse nlsw88
> drop if missing(wage) | missing(married) | missing(occupation)
> egen g=group(occupation married)
> gsort g -wage
> by g: keep if _n<4
> keep occupation married wage g
> list, sepby(g)
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> you can adapt this code for your needs replacing variables occupation
> and marital status with country and year. Not sure what is your
> "popularity" variable. In the example it is wage.
>
> Best, Sergiy
>
>
> On Tue, May 7, 2013 at 10:49 AM, Estrella Gomez <estrellastata@gmail.com> wrote:
>> Hi, statalisters
>>
>> I have a dataset with songs by year and country. I would like to keep
>> only the top 100 songs for each country each year (there are 18
>> countries and 6 years). I have tried the following:
>>
>> gsort country year -tot_sales
>> *because I want the songs with higher number of sales
>>
>> gen top100=0
>> bysort country year: replace top100=1 in 1/100
>> *to generate a dummy that takes value one for the top 100 songs, so I
>> can drop observations that equals zero
>>
>> However, Stata says that it's not possible to combine "by" with "in"
>>
>> Any idea?
>> Thanks a lot,
>> Estrella
>> *
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