An alternative
collapse (max) var1, by(year)
----- Original Message -----
From: "Michael Blasnik" <[email protected]>
To: <[email protected]>
Sent: Sunday, September 24, 2006 10:01 PM
Subject: st: Re: how to keep maximum value
bysort year (var1): keep if _n==_N
Michael Blasnik
----- Original Message -----
From: "FUKUGAWA, N." <[email protected]>
To: <[email protected]>
Sent: Sunday, September 24, 2006 9:33 PM
Subject: st: how to keep maximum value
> Dear all,
> Suppose we have data as follows,
>
> year var1
> 1997 14
> 1997 32
> 1997 19
> 1998 18
> 1998 42
> 1998 50
> 1999 3
> 1999 23
> 1999 37
>
> we want to keep observations by year if var1 is maximum within
> the same year.
>
> year var1
> 1997 32
> 1998 50
> 1999 37
>
> How can I do this using stata9?
> Thank you in advance.
> ---
> FUKUGAWA Nobuya, Ph.D.
> [email protected]
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