Summary statistics for sf12000zcta5distance25miles dataset :

by Jean Roth , jroth@nber.org , 4 Jan 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
        zip1 |          0
        zip2 |          0
 mi_to_zcta5 |  4,036,240    25.08861     10.0743   .0329837   40.23359

by Jean Roth , jroth@nber.org , 4 Jan 2016