Summary statistics for drug2007q2 dataset :

by Jean Roth , jroth@nber.org , 18 Dec 2015

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    314173     5332285    27115.94    5198124    5478536
    drug_seq |    314173    1.01e+09    107635.4   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    314173    1.247641    .4316426          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5752    2.01e+07    38327.18   1.91e+07   2.02e+07
  exp_dt_num |      5752    17604.81    1399.138     -19085      22219
     nda_num |     74500     24428.1    12775.41       1241      89984

by Jean Roth , jroth@nber.org , 18 Dec 2015