Summary statistics for ther2007q3 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 128512 5422594 28843.8 5285252 5530192 dsg_drug_seq | 128512 1.01e+09 99036.52 1.01e+09 1.01e+09 start_dt | 118213 2.01e+07 45017.35 1.01e+07 2.01e+07 start_dt_num | 118213 16598.08 1656.131 -347882 17523 end_dt | 69603 2.01e+07 21679.24 1.91e+07 2.01e+07 -------------+-------------------------------------------------------- end_dt_num | 69603 16964.22 794.5935 -19195 17529 dur | 28259 1787.462 8864.351 0 99360 dur_cod | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015