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From | Maarten buis <maartenbuis@yahoo.co.uk> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: scalar do not allow -if- |
Date | Wed, 17 Nov 2010 16:17:26 +0000 (GMT) |
--- On Wed, 17/11/10, Tomas Lind wrote: > Now I want to calculate "hig" (in the > bottom of the loop) and save it in the dataset with > aggregated data (where w1, w2, w3 are -scalars-). > > scalar hig = 1 if (w1 > w2) & (w1 > w3) > scalar hig = 2 if (w2 > w1) & (w2 > w3) > scalar hig = 3 if (w3 > w1) & (w3 > w1) > > However, -if- is not allowed in combination with > -scalar-. -if- after a command is supposed to work on the dataset, i.e. the result is a vector of trues and falses, one for each observation in the dataset. This is why -scalar- cannot handle it: it needs to be fed one number. -if- on its own or before a command is supposed to work on its own and will result in a scalar outcome either true or false. So you could get your scalar -hig- by: if (w1 > w2) & (w1 > w3) scalar hig = 1 if (w2 > w1) & (w2 > w3) scalar hig = 2 if (w3 > w1) & (w3 > w1) scalar hig = 3 or: if (w1 > w2) & (w1 > w3) { scalar hig = 1 } if (w2 > w1) & (w2 > w3) { scalar hig = 2 } if (w3 > w1) & (w3 > w1) { scalar hig = 3 } or: scalar hig = cond( (w1 > w2) & (w1 > w3), 1, /// cond( (w2 > w1) & (w2 > w3), 2, /// cond( (w3 > w1) & (w3 > w1), 3, .))) 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/