Summary statistics for drug2006q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    336519     4922215    29425.86    4793437    5015804
    drug_seq |    336519    1.01e+09    118915.1   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    336519    1.268324    .4430876          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4497    2.01e+07    23883.82   1.91e+07   2.03e+07
  exp_dt_num |      4497    17207.68     863.866     -17902      24380
     nda_num |     85537    23433.86    11626.86        198      89959

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