Summary statistics for drug2008q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    369888     5634991    31251.83    5476771    5771298
    drug_seq |    369888    1.01e+09      128715   1.01e+09   1.01e+09
    role_cod |         0
    drugname |         0
     val_vbm |    369888    1.251684    .4339814          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      5607    2.01e+07    26137.27   1.91e+07   2.11e+07
  exp_dt_num |      5607    17958.71    943.1918     -18688      54906
     nda_num |     84846     25191.1    14863.51       2126      89959

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