Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: Dropping all subjects but those in the last period

From   Nick Cox <>
To   "" <>
Subject   Re: st: RE: Dropping all subjects but those in the last period
Date   Mon, 8 Apr 2013 20:50:49 +0100

As Elan implies, Stata is very good at such problems. There is
certainly no need for intricate choreography with files. Here is
another solution:

bysort id (year) : drop if year[_N] < 2000


On 8 April 2013 20:39, Cohen, Elan <> wrote:

> Let's assume 2010 is the "last year".  Then:
> egen flag = total(year==2010), by(id)
> drop if !flag

Miguel Angel Duran

> My dataset includes observations for about 9000 companies per year in a
> twenty years period. To clean the dataset, I would like to drop all those
> companies that are not present in the last year (because the rest went
> bankrupt or were absorbed), but I do not know how to do it. Can this be done
> just by splitting the datasets by period and then merging them?  Each
> company has the same id across years.
*   For searches and help try:

© Copyright 1996–2016 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index