Summary statistics for ther2010q1 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 212392 6594408 40515.69 6394242 6710720 dsg_drug_seq | 212392 1.01e+09 156332.5 1.01e+09 1.01e+09 start_dt | 196506 2.01e+07 100841.2 20307 2.01e+07 start_dt_num | 196501 17422.26 1571.91 -348712 18621 end_dt | 109722 2.01e+07 64028.8 1.96e+07 4.01e+07 -------------+-------------------------------------------------------- end_dt_num | 109722 17836.18 2340.401 -1645 748473 dur | 45151 115.4355 442.7627 -8 21050 dur_cod | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015