Summary statistics for drug2006q3 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    272141     5082937    21816.49    4963115    5160163
    drug_seq |    272141    1.01e+09    90994.39   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    272141    1.246593    .4310284          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5191    2.01e+07    141649.1   1.91e+07   3.01e+07
  exp_dt_num |      5191    17484.89    5171.414     -19419     382528
     nda_num |     61092    24651.81    14303.27       1145      89959

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