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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Generate combined with if |
| Date | Wed, 10 Aug 2011 16:56:09 +0200 |
On Wed, Aug 10, 2011 at 4:48 PM, Katia Bobulova wrote: > I would like to construct this new price, given by the combination of > other prices when there is a particular id. > > I typed: > > by date: gen p=(price_b (if id==10) - price_b (if id==3))/ price_b (if id==3) This does not make sense to me, what should happen when id != 10 or when id != 3? Anyhow, the syntax is not valid as you noticed. Consider looking at -help cond()-. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/