Summary statistics for drug2009q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    516001     6451661    41435.21    6253237    6710716
    drug_seq |         0
    role_cod |         0
    drugname |         0
     val_vbm |    516001    1.281457    .4497102          1          2
-------------+--------------------------------------------------------
       route |         0
    dose_vbm |         0
      dechal |         0
      rechal |         0
     lot_num |         0
-------------+--------------------------------------------------------
      exp_dt |      3360    2.01e+07    77622.68   1.91e+07   2.11e+07
  exp_dt_num |      3360    18786.37    2833.977     -17777      55091
     nda_num |    114728    25029.19    13958.71         97      90845

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