Summary statistics for ther2004q1 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |     85628     4301822     20806.6    4204616    4498036
dsg_drug_seq |     85628    1.00e+09     80100.4   1.00e+09   1.01e+09
    start_dt |     77458    2.00e+07    196399.5   1.90e+07   5.00e+07
start_dt_num |     77458    15588.09    7176.483     -20911    1111158
      end_dt |     47801    2.00e+07    111715.2   1.00e+07   3.00e+07
-------------+--------------------------------------------------------
  end_dt_num |     47801    15801.41    4080.105    -349963     381402
         dur |     17487    1890.814    9087.162          0      99360
     dur_cod |         0

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