On Feb 11, 2010, at 2:33 AM, N.J. Cox wrote:
> - -summarize-
> ===========
>
> . sysuse auto
> (1978 Automobile Data)
>
> . su rep78 if rep78 == .
>
> Variable | Obs Mean Std. Dev. Min Max
> - -------------+--------------------------------------------------------
> rep78 | 0
>
> . ret li
>
> scalars:
> r(N) = 0
> r(sum_w) = 0
> r(sum) = 0
Interestingly,
. su rep78 if rep78==0, detail
Repair Record 1978
-------------------------------------------------------------
no observations
Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
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