Summary statistics for ther2013q4 dataset :

by Jean Roth , jroth@nber.org , 6 Apr 2017

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    291,948    1.01e+08    6.53e+07   3.68e+07   9.61e+08
      caseid |    291,948     9489051    437757.7    3681487   1.03e+07
dsg_drug_seq |    291,948    4.611266    10.86215          1        317
    start_dt |    276,861    1.47e+07     8893988        410   2.01e+07
start_dt_num |    276,860    18776.24    1551.241    -347915      19867
-------------+---------------------------------------------------------
      end_dt |    135,322    1.60e+07     8060504       1967   2.01e+07
  end_dt_num |    135,322    19186.44    816.6328        549      19723
         dur |      1,694    32.43058    211.7253          1       4273
      durstr |          0
     dur_cod |          0

by Jean Roth , jroth@nber.org , 6 Apr 2017