Summary statistics for drug2005q3 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    307227     4747342     25147.4    4627939    4876136
    drug_seq |    307227    1.01e+09    96970.44   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    307227    1.267616    .4427172          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      4520    2.01e+07    153103.3   1.91e+07   3.01e+07
  exp_dt_num |      4520    17027.06    5590.446     -19633     381768
     nda_num |     70951    22948.54    11145.65       1938      89892

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