Summary statistics for drug2004q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    277591     4508347    23598.94    4391150    4601412
    drug_seq |    277591    1.01e+09    90737.39   1.00e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    277591    1.290597    .4540385          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4281    2.00e+07    58240.77   1.91e+07   2.01e+07
  exp_dt_num |      4281    16597.79    2125.408     -20088      18231
     nda_num |     30747     24596.9    15476.51       2168      89971

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