This project uses the “drvisits” dataset. In 1997 Germany reformed their healthcare system to try to reduce costs. Ninety percent of the population is enrolled in this healthcare system and it is publically funded. ThesedatatrackasampleoftheGermanpopulationbeforeandafterthe reform. Theoutcomeofinterestis numvisit, the number of doctor visits in the last 3 months before the interview. Additional variables collected are: age and education (in years) ; married (0/1); self-reported health status (badh==1 if bad health); loginc is log of household income; reform (0==pre; 1==post); id – subject identifier. Note, there are at most two records for any one id, and in some cases there is just one.