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From | Maarten buis <maartenbuis@yahoo.co.uk> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: output conventions |
Date | Mon, 14 Jun 2010 06:50:32 +0000 (GMT) |
--- On Mon, 14/6/10, Tim wrote: > My specific problem today is what does / in front of a > parameter identifier mean? For example, boxcox output has > estimates for "/theta". What does the / mean? That typically means that Stata maximized a transformation of that parameter (say ln[theta]), and for ease of interpretation backtransformed that parameter. The reason for maximizing with respect to a transformation of a parameter is that this way you ensure that the parameter takes only certain values, in the example only strictly positive numbers. > I'm asking the more general question (where is this > documented) so I don't have to ask again next time I come > across an output symbol I don't understand. Good question, but I don't know. I guess I learned this particular point relatively early in my Stata career. I was introduced to Stata while during a survival analysis course, and this conventions is much used in those models as well, so I guess it was explained to me, and so I never had to look it up. 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/