Summary statistics for sf12000zcta5distance100miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
        zip1 |          0
        zip2 |          0
 mi_to_zcta5 | 43,061,760    101.8804    40.33384   .0329837   160.9344

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