Summary statistics for drug2011q4 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 |    735967     1.16245    .3688636          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3639    2.01e+07    26161.59   1.91e+07   2.10e+07
  exp_dt_num |      3639    19392.32    953.2441     -16712      50860
     nda_num |    171549    28692.71    26285.21        977     202570

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