--- Tiago Pereira asked:
> > Supose I have two variables, X and Y with 50 and 75 observations,
> > respectively. How do I delete the first 25 observations of the
> > variable Y without losing the first 25 observations of the X
> > variable?
--- Daniel Schneider answered:
> You can't. More importantly, why would you want to do that? Most
> (all?) commands will drop missing values anyway when producing
> results.
There is actually good reason why that is difficult, and that has to do
with the convention that in a dataset the rows represent the
observations. Say we have three observation: one each on individuals
named Maarten, Tiago, and Nick, and consider the following dataset:
id country
Maarten .
Tiago Brazil
Nick UK
What would loosing only the first observation of variable country mean?
id country
Maarten Brazil
Tiago UK
Nick .
or:
id country
Maarten Brazil
Tiago Brazil
Nick UK
or ...
Hope this helps,
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
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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