* OLS Model for Expenditure on Services
*
* Keywords:
*     regression, ols, log, growth, expenditure, services, graph
*
* Description:
*     We illustrate how to estimate Log-Linear OLS Growth Model for
*     Expenditure on Services and create a graph
*
* Author(s):
*     Skif Pankov
*
* Source:
*    Damodar N. Gujarati and Dawn C. Porter, Basic Econometrics - 5th Edition
*    McGraw-Hill International Edition, Chapter 6, Example 6.4 (page 163)
*
sample 1 55

* Reading the datafile and naming the variables - we use the same datafile as 
* in Example 3.2
read(data_3.2.shd) foodexp totalexp

* Generating a log of totalexp 
genr lnexp = LOG(totalexp)

* Running an OLS regression of foodexp on lntotalexp:
ols foodexp lnexp / rstat linlog

* Creating a plot of foodexp against totalexp:
graph foodexp totalexp

stop