Summary statistics for primaryid variable in indi2015q2 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    660,263    1.16e+08    7.24e+07   3.64e+07   1.11e+09

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