Summary statistics for ther2017q4 dataset :

by Jean Roth , jroth@nber.org , 19 Jun 2018

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    442,433    1.65e+08    1.64e+08   3.94e+07   1.41e+09
      caseid |    442,433    1.38e+07    925497.4    3937953   1.44e+07
dsg_drug_seq |    442,433    6.396304    12.07173          1        267
    start_dt |    418,626    1.45e+07     9020827       1936   2.92e+07
start_dt_num |    418,626    20001.04    1953.273    -349788     349431
-------------+---------------------------------------------------------
      end_dt |    201,545    1.57e+07     8349553       1965   2.92e+07
  end_dt_num |    201,545     20238.8    1508.277      -2438     349784
         dur |        354    9.142655    15.25794          1        180
     dur_cod |          0

by Jean Roth , jroth@nber.org , 19 Jun 2018