Summary statistics for primaryid variable in drug2017q2 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |  1,191,697    1.50e+08    1.27e+08   3.89e+07   1.36e+09

by Jean Roth , jroth@nber.org , 8 Feb 2018