Summary statistics for drug2005q2 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    319005     4664238    26168.14    4548241    4799765
    drug_seq |    319005    1.01e+09    105441.8   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    319005    1.274917    .4464733          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5215    2.01e+07    416873.1   1.91e+07   5.01e+07
  exp_dt_num |      5215    17040.42    15226.71     -20057    1112412
     nda_num |     63054    23312.44    11651.18        383      89892

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