Summary statistics for gaz2016zcta5distance500miles dataset :

by Jean Roth , jroth@nber.org , 15 Jun 2017

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
        zip1 |          0
        zip2 |          0
 mi_to_zcta5 |268,076,626    303.9469    126.0031   .0492289        500

by Jean Roth , jroth@nber.org , 15 Jun 2017