Summary statistics for gaz2015zcta5distance500miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
        zip1 |          0
        zip2 |          0
 mi_to_zcta5 |268,076,436    303.9468     126.003   .0492289        500

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