Summary statistics for drug2006q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    291710     5159433    25298.25    5045669    5226527
    drug_seq |    291710    1.01e+09    97280.71   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    291710    1.232025    .4221256          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3684    2.01e+07    171028.7   1.91e+07   3.01e+07
  exp_dt_num |      3684    17543.18     6243.99     -19238     382839
     nda_num |     67022    23991.37    13352.36       1938      89997

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