In this section, we demonstrate the application of our sandwich estimator in a practical setting. The two datasets used are random samples of size 500 and 30 airmen, sampled independently, from the Federal Aviation Administration’s Decision Support Systems (DSS) and constructed as a longitudinal dataset, as described by Peterman [12]. Airmen undergo a flight physical from an Aviation Medical Examiner (AME) and must meet certain physical requirements to hold a Class I, II, or III medical certificate. The random samples taken from the DSS were restricted to airmen who took a Class I, II, or III flight physical in each of the four years over 2002-2005.
