Summary statistics for drug2008q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |         0
    drug_seq |         0
    role_cod |         0
    drugname |         0
     val_vbm |    416134    1.238344     .426071          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3072    2.01e+07    54191.11   1.91e+07   2.11e+07
  exp_dt_num |      3072    18206.59    1976.059     -18476      55669
     nda_num |     91928    24839.94    14569.14          1      90124

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