Summary statistics for ther2007q1 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 120889 5246602 28225.37 5120319 5337807 dsg_drug_seq | 120889 1.01e+09 105516.8 1.01e+09 1.01e+09 start_dt | 110618 2.00e+07 32129.49 1.91e+07 2.01e+07 start_dt_num | 110618 16498.91 1196.986 -17453 17512 end_dt | 67344 2.01e+07 18325.76 1.97e+07 2.01e+07 -------------+-------------------------------------------------------- end_dt_num | 67344 16820.43 672.6801 2557 17499 dur | 25447 1528.139 8337.95 0 99360 dur_cod | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015