Summary statistics for drug2004q2 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    233376     4365471    20456.68    4263257    4543974
    drug_seq |    233376    1.00e+09     83334.7   1.00e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    233376    1.278276    .4481511          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4009    2.00e+07    56556.29   1.90e+07   2.02e+07
  exp_dt_num |      4009    16413.58    2066.693     -20119      22040
     nda_num |     32725    23283.28    12339.77       2098      89771

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