Summary statistics for ther2009q4 dataset :

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

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
   primaryid |    215796     6451268    41496.66    6253237    6710716
dsg_drug_seq |    215796    1.01e+09    157355.2   1.01e+09   1.01e+09
    start_dt |    201375    2.01e+07    83758.03      80701   2.21e+07
start_dt_num |    201372     17275.9      1416.6     -18415      91118
      end_dt |    105804    2.01e+07     22005.7   1.97e+07   2.01e+07
-------------+--------------------------------------------------------
  end_dt_num |    105804    17728.87    827.9548       2557      18262
         dur |     44481    137.4127    488.4794       -363      14619
     dur_cod |         0

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