Summary statistics for drug2009q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    411532     6084205    32513.43    5909980    6253112
    drug_seq |         0
    role_cod |         0
    drugname |         0
     val_vbm |    411532    1.279043    .4485291          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3059    2.01e+07    25893.28   1.99e+07   2.11e+07
  exp_dt_num |      3059    18381.98    941.4434      10481      54787
     nda_num |     94049    25568.85    15429.81          1      90177

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