Summary statistics for primaryid variable in outc2016q4 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   primaryid |    220,841    1.36e+08    9.06e+07   4.08e+07   1.29e+09

by Jean Roth , jroth@nber.org , 18 Sep 2017