Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: re: logistic function


From   John Ataguba <[email protected]>
To   [email protected]
Subject   Re: st: re: logistic function
Date   Thu, 18 Jun 2009 17:32:20 +0000 (GMT)

Thanks Kit.  

Are the mu and s mean and standard deviations of the predictions? I'm not clear on this. 

Thanks for the assistance

Regards

 
 
Jon   



----- Original Message ----
From: Kit Baum <[email protected]>
To: [email protected]
Sent: Thursday, 18 June, 2009 19:24:24
Subject: 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



*
*   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/



      


*
*   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/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index