Summary statistics for drug2008q2 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    384765     5742294    31546.53    5579951    5895337
    drug_seq |         0
    role_cod |         0
    drugname |         0
     val_vbm |    384765    1.244549    .4298202          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      6052    2.01e+07     40885.4   1.91e+07   2.23e+07
  exp_dt_num |      6052    18013.66      1493.1     -18688      98370
     nda_num |     89371    24664.35    13276.79        406      89959

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