Summary statistics for primaryid variable in drug2017q4 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |  1,213,842    1.55e+08    1.29e+08   3.94e+07   1.41e+09

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