Summary statistics for drug2010q4 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 |    640850    1.271781    .4448781          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4514    2.01e+07    19749.27   2.00e+07   2.11e+07
  exp_dt_num |      4514    18997.95    716.4859      13515      55091
     nda_num |    143667    24790.27    14056.11        552     201532

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