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Bea said
I wrote:
egen newvar = wtmean(price), weight(quantity) if contract=="S", by(date)
but doesn't work.
You have the syntax wrong. If you -ssc desc _gwtmean- you will see
that weight() is an option, so it must come after the comma.
. egen junk = wtmean(price) if foreign, weight(displacement) by(rep78)
(52 missing values generated)
Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html
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