Summary statistics for primaryid variable in drug2018q4 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |  1,546,835    1.83e+08    1.86e+08   3.67e+07   1.56e+09

by Jean Roth , jroth@nber.org , 7 Mar 2019