Summary statistics for primaryid variable in indi2015q4 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    719,398    1.21e+08    7.11e+07   3.79e+07   1.18e+09

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