Summary statistics for drug2007q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    323247     5247220    28461.92    5120319    5337807
    drug_seq |    323247    1.01e+09    112542.1   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    323247    1.229864    .4207462          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      7249    2.01e+07    168843.9   1.91e+07   3.01e+07
  exp_dt_num |      7249    17649.55    6165.304     -19146     382865
     nda_num |     78024    23943.75     12470.7          1      89997

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