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Re: st: Replacing values
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Replacing values
Date
Tue, 9 Jul 2013 22:32:34 +0100
egen pop2005 = total(pop_region / (year == 2005)), by(state district)
replace pop_region = pop2005 if missing(pop_region)
In your example, this works
bysort state district (year) : replace pop_region = pop_region[_N]
For a review of technique see
http://www.stata-journal.com/article.html?article=dm0055
Nick
[email protected]
On 9 July 2013 22:12, Roberto Ferrer <[email protected]> wrote:
> For every possible year in the data, I want to replace the missing
> values of the variable pop_region using the corresponding value of
> variables state and district of year 2005. So the first value of
> pop_region in the example
> should be 25, the second 25, ..., the sixth 50, the eighth 62, etc.
>
> year state district st_pop pop_region
> 1995 a 1 100 .
> 1995 a 2 100 .
> 1995 a 2 100 .
> 1995 a 2 100 .
> 1995 a 2 100 .
> 1995 a 3 100 .
> 1995 a 3 100 .
> 1995 b 1 200 .
> --------------------------------------------------------
> 2005 a 1 100 25
> 2005 a 2 100 25
> 2005 a 3 100 50
> 2005 a 3 100 50
> 2005 b 1 200 62
> 2005 b 1 200 62
> 2005 b 1 200 62
> 2005 b 1 200 62
>
> I tried this (and other stuff) which seems too involved for the task
> and doesn't work of course:
>
> levelsof year, local(lyear)
> levelsof state, local(lstate)
> levelsof district, local(ldistrict)
>
> foreach y of local lyear {
> foreach s of local lstate {
> foreach r of local ldistrict {
> local reval = pop_region if yearobs==2005 & state==`s' &
> district==`r'
> replace pop_region = `reval' if state == `s' & district == `r'
> }
> }
> }
>
> Thanks.
> *
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