Summary statistics for drug2009q2 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |         0
    drug_seq |         0
    role_cod |         0
    drugname |         0
     val_vbm |    461011    1.281464    .4497137          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3828    2.01e+07    29119.45   1.91e+07   2.07e+07
  exp_dt_num |      3828    18373.01    1058.947     -18508      40268
     nda_num |     98650    25047.42    14317.86          1      90419

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