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Re: st: Last modification to a data file

From   Maarten buis <>
Subject   Re: st: Last modification to a data file
Date   Tue, 27 Nov 2007 10:08:52 +0000 (GMT)

--- Louis Boakye-Yiadom <> wrote:
> Thanks. I was, however, hoping there is a way of
> knowing the actual (or kind of) modification mdade.

The way to document the modifications you make to a 
data file is to make these modifications in a 
do-file, and save the original data and the do-file, 
and not the modified data. Whenever you need the 
modified data, you first run the do-file (I often 
call that do-file

This is always a good idea, not only because that 
way you keep a complete record of all changes you 
made, but also because in a real data-analysis 
project everybody makes mistakes during data-
preparation. If you keep the original data and the 
do-file that made the modifications, than correcting 
the mistake is often matter of seconds. If you did 
not store the do-file, it is often a matter of days, 
and if you did not store the original data, all is 

-- Maarten

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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