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Re: st: indexing for first non-missing value


From   James Bernard <jamesstatalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
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
<scott.merryman@gmail.com> wrote:
> egen firstyear = min(year), by(id)
>
> Scott
>
> On Wed, May 15, 2013 at 6:46 AM, James Bernard <jamesstatalist@gmail.com> 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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