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Re: st: indexing for first non-missing value
From
Scott Merryman <[email protected]>
To
[email protected]
Subject
Re: st: indexing for first non-missing value
Date
Wed, 15 May 2013 06:52:30 -0500
egen firstyear = min(year), by(id)
Scott
On Wed, May 15, 2013 at 6:46 AM, James Bernard <[email protected]> wrote:
> Hi all,
>
> I have been dealing with a dataset where I need to copy the value of
> the first non-missing value of one variable to create a new variable
> called first year observed:
>
> id year first year observed
> ------- ------------
> -----------------------------
> A . 1996
> A 1996 1996
> A 1997 1996
> A 1998 1996
> A . 1996
> A . 1996
> B 1998 1998
> B 1999 1998
> B . 1998
> B . 1998
>
>
> Going through Stata discussions, I found out that one way is to use indexing
>
> bysort id: gen first_year_observed=year[1]
>
> where the bracket indicates the first non-missing value
>
> But this find only the first value, be it missing or non-missing. Is
> there any simple indexing way?
>
>
> Thanks,
> James
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