SO5032: Lab Materials
Table of Contents
1. Week 9 Lab
1.1. Logistic Regression
This file contains Stata code to run the credit card example in A&F:
do http://teaching.sociology.ul.ie/so5032/creditcard.do
Execute the code to create the working data file, and examine the
relationship between having a credit card and income (compare means,
group income and cross tabulate, etc.). The variable card records
whether a credit card is held, and income is the explanatory variable.
Now fit the linear probability model and interpret it:
reg card income
Save the predicted values:
predict plin
Now fit the logistic regression, and interpret it:
logit card income
Save the predicted values and graph them against income.
predict plog scatter card plog income
Compare this graph with that relating the first model's predicted values to income:
scatter card plog plin income
1.1.1. Predicted values by hand
Calculate predicted values by hand (log-odds, odds and probabilities) for income = 10, 11, 60, and 61.
1.1.2. Age and health
Repeat the exercise with this alternative data file:
do http://teaching.sociology.ul.ie/so5032/labs/limit.do
which has data on age and whether the respondent finds their health limits their daily activities.