Summary statistics for drug2004q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    235878     4302895    21106.13    4204616    4498036
    drug_seq |    235878    1.00e+09    80327.57   1.00e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    235878    1.276054    .4470446          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4431    2.00e+07    153827.8   1.90e+07   3.01e+07
  exp_dt_num |      4431    16493.29    5616.093     -20119     381738
     nda_num |     33102     23062.7    11366.23       2079      89897

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