Summary statistics for a00100 variable in zipcode2007 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
      a00100 |    232,681    3.60e+07    1.28e+08   -5442273   1.52e+10

by Jean Roth , jroth@nber.org , 20 Jun 2017