<>
" In my prior example I had the line gen d = (runiform()>0.7)"
Which is very necessary as otherwise "d" will not be a dummy, as John
thought, but "displacement" if -varabbrev- is off...
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Kit Baum
Gesendet: Donnerstag, 18. Juni 2009 19:24
An: [email protected]
Betreff: st: re: logistic function
<>
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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