00312nam a2200097Ia 4500008004100000082002200041100002100063245003500084260003900119490005600158220204s9999    xx            000 0 und d  a30:519.233.5bHAR  aHardy, Melissa A 0aRegresson with dummy variables  aNew DelhibSage Publicationsc1993  aQuantitative applications in the social sciences 93