Summary statistics for drug2007q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    374284     5526056    32565.27    5378178    5625752
    drug_seq |    374284    1.01e+09    124489.7   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    374284     1.23542    .4242617          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5398    2.01e+07      138884   1.91e+07   3.01e+07
  exp_dt_num |      5398    17861.83     5070.13     -18902     383199
     nda_num |     83046    24240.03    13117.41       1241      89959

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