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st: re: logistic function


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: logistic function
Date   Thu, 18 Jun 2009 13:24:24 -0400

<>
Nick pointed out invlogit(), which does not appear in the function list of density functions, but of math functions. Quite so, but it doesn't save much typing:

local cum1 1/(1+exp(-((_b[_cons]+ _b[trunk]*mut + _b[mpg]*mum + _b[d]*1) - mu)/s))

scalar onea = invlogit((_b[_cons]+ _b[trunk]*mut + _b[mpg]*mum + _b[d]*1 - mu)/s)

will indeed generate the same values, but you still have to compute mu and s and include them in the function argument.


In my prior example I had the line

gen d = (runiform()>0.7)

which did not appear in the posting.


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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