 |
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
Re: st: -graph twoway (function ...)- question
I don't have an answer to your specific question, but another way to go
is to plot predicted probabilities. My -oprobpr- package might help for
this. (-oprobpr- only works after -oprobit- not -probit-, but oprobit
will estimate the same model as probit if there are only two response
categories; just use the -categories()- option to specify which response
category you want plotted.
-Nick Winter
Andrea Bennett wrote:
Dear all,
I have estimated average marginal effects from a probit regression with
-margeff- and would like to generate a graph which plots the marginal
effects for 3 age categories (dummies) dependent on a continuous
variable called cont.
The model is as such:
y = b0 + b1*age2 + b2*age3 + b3*age2*cont +b4*age3*cont + b5*cont +
controls
As age2 and age3 are dummies, would the following graph command be correct:
twoway (function age1 = _b[cont]*x, range(0 0.5)) (function age2 =
_b[age2] + (_b[cont] + _b[cont_age2])*x, range(0 0.5)) (function age3 =
_b[age3] + (_b[cont] + _b[cont_age3])*x, range(0 0.5))
The way I understand it, since I have now marginal effects I can work
equivalently to linear models. Then the above graph should be correct,
right? Further, this would also be correct when introducing other
interactions with -cont- as long as I am looking at the marginal effects
of age groups when -cont- changes?
Many thanks for your considerations,
Andrea
*
* 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/
--
--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics [email protected] e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904
*
* 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/