Summary statistics for sf12000zcta5distance50miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
        zip1 |          0
        zip2 |          0
 mi_to_zcta5 | 12,948,786    50.54927    20.39413   .0329837    80.4672

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