*
* Soc 229A:  Event History Analysis
* 
* Assignment #3 do file

*** Topic: Year at which country passes its first comprehensive pro-environmental law

version 10
capture log close
log using "C:\Users\schofer\Documents\Classes\2008 Soc 229 EHA\Examples\Assignment3.log",replace
clear
set memory 100m
use "C:\Users\schofer\Documents\Classes\2008 Soc 229 EHA\Examples\Assignment 3 Env.dta" 

***Notes on data
***All countries with unreliable law data were omitted (13 countries)
***Data on dependent variable taken from ECOLEX
***Total sample: 97 countries (81 failures)
***Analyses run from 1970-2001
***First failure: 1970
***Last failure: 2000

***Notes on independent variables
***West=dummy variable (1=West)
***Education=Education expansion, interpolated
***Population=total population, logged, interpolated
***Democracy=Freedom House index of political freedoms and civil liberties, interpolated
***Degradation=resource consumption, logged, interpolated
***INGO=international non-governmental organization memberships, logged, interpolated
***NGO=domestic environmental NGOs, logged
***GDP=GDP per capita, logged, interpolated

* Let's look at non-Western countries only
keep if west == 0


*Set up survival data
stset end, id(newid3) failure(es==1) time0(start) 

*Graph hazard function
sts graph, haz

* Constant rate model
streg gdp degradation education democracy, dist(exponential) robust nohr

* Cox Model
stcox gdp degradation education democracy, efron robust nohr

exit