Summary statistics for drug2005q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    322681     4834828    27086.12    4705002    4932973
    drug_seq |    322681    1.01e+09    105366.4   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    322681    1.263486    .4405245          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4309    2.01e+07    458736.9   1.91e+07   5.01e+07
  exp_dt_num |      4309    17283.91       16757     -19572    1112501
     nda_num |     79701    23399.65    12111.81          2      89959

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