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Re: st: Dropping Variables - Simple Question


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Dropping Variables - Simple Question
Date   Sun, 12 Aug 2007 08:20:40 -0400

I think your question is: how do you drop the observations
of Y where X is missing? In that case, the answer is:

 drop if missing(X)

This will keep the 50 observations of X, plus the 50 observations
of Y where X is not missing.

hth,
Jeph

tiago.pereira@incor.usp.br wrote:
Dear statalisters,

I have a simple question:

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?

Although simple, I have not been able to find out a solution.

Thank you again.

Best regards,

Tiago



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