Summary statistics for drug2012q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    862191     8140292    73537.19    7805388    8406255
    drug_seq |    862191    1.02e+09    275993.1   1.02e+09   1.02e+09
    role_cod |         0
    drugname |         0
     val_vbm |    862191    1.160831    .3673752          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5062    2.01e+07    335631.1   1.99e+07   3.92e+07
  exp_dt_num |      5062    19731.61    12259.43      12722     717214
     nda_num |    198814    31873.58     33452.7          1     203388

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