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st: graph


From   Reka Sundaram-Stukel <rsundara@wisc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: graph
Date   Sun, 6 Apr 2003 23:09:05 -0500

Dear Statalist,

I am a new stata user so would appreciate any help. I estimated an ordered probit model and I would like to create a graph that has probability on the y axis and land on the x axis holding all values (except land) at their mean levels. I know one can do this easily in gauss using the following code. Does any one have any ideas how to do this in STATA. I have tried using predict and plotting it, but it generates the probabilities for each observation.

Thanking you in advance,

Reka

Here is the gauss code:

library pgraph;

/*estimated critical values--first critical vlaues normalized to zero??*/
c1= -0.28;
c2= 0.01;
/*mean/median values for control variables*/
let z = { means of explanatory variables except land };

/*Estimated coefficients for z variables*/
let beta = { coeffs of z variables };
beta_t=0.00652; /*coefficient for land varialbe*/

t=seqa(0.5,1,100);
beta_x=beta_t*t + beta'z;

probc1=cdfn(c1-beta_x);
probc3=cdfnc(c2-beta_x);
probc2=1-probc1-probc3;

xy(t,probc1~probc2~probc3);

saved(


Thanking you in advance
Reka Sundaram-Stukel

Reka Sundaram-Stukel
Agriculture And Applied Economics
320 Taylor Hall



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