Summary statistics for ther2012q4 dataset :

by Jean Roth , jroth@nber.org , 7 Apr 2017

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    325,020    9.21e+07    5.59e+07   3.57e+07   8.81e+08
      caseid |    325,020     8757413    332271.4    3567656    9337231
dsg_drug_seq |    325,020    4.462236     8.94572          1        286
    start_dt |    308,275    1.53e+07     8515994         12   3.01e+07
start_dt_num |    308,271    18275.87    2306.351    -346723     382230
-------------+---------------------------------------------------------
      end_dt |    148,367    1.61e+07     8022425       1212   2.91e+07
  end_dt_num |    148,365    18746.27    1991.795    -343040     347965
         dur |      2,322    53.34223    306.8232          0       7100
      durstr |          0
     dur_cod |          0

by Jean Roth , jroth@nber.org , 7 Apr 2017