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Re: st: indexing for first non-missing value
From
James Bernard <[email protected]>
To
[email protected]
Subject
Re: st: indexing for first non-missing value
Date
Wed, 15 May 2013 20:13:55 +0800
Thanks Scott
On Wed, May 15, 2013 at 7:52 PM, Scott Merryman
<[email protected]> wrote:
> 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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