Summary statistics for primaryid variable in rpsr2015q2 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |     20,478    1.11e+08    2.19e+07   3.70e+07   1.04e+09

by Jean Roth , jroth@nber.org , 6 Apr 2017