* Load the Cholesterol-LDL data
* The web site has the Stata data set

* Describe it
describe


* Summarize it
summarize

* Do a naive logistic regression of disease status
* The predictors are age, smoking status and cholesterol
glm chd age smoke cholest, family(binomial)

* Do an instrumental variables logistic regression
* The instrument is LDL
qvf chd age smoke cholest (age smoke ldl), family(binomial)