Summary statistics for primaryid variable in outc2017q4 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    243,176    1.49e+08    9.79e+07   3.94e+07   1.41e+09

by Jean Roth , jroth@nber.org , 19 Jun 2018