Summary statistics for drug2006q2 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    310766     5004848    25073.97    4871816    5117603
    drug_seq |    310766    1.01e+09    106169.3   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    310766    1.252621    .4345161          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5991    2.01e+07    26172.66   1.91e+07   2.09e+07
  exp_dt_num |      5991    17297.37    955.5664     -19299      47056
     nda_num |     75052    23487.67    11475.45        123      89983

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