Summary statistics for primaryid variable in indi2014q1 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    582,518    1.00e+08    3.97e+07   3.72e+07   9.78e+08

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