Summary statistics for primaryid variable in indi2014q2 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    421,500    1.05e+08    5.89e+07   3.31e+07   1.00e+09

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