Summary statistics for sf12010countydistance500miles dataset :

by Jean Roth , jroth@nber.org , 29 Mar 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     county1 |          0
mi_to_county |  2,637,350    315.4074    122.1982   1.407852   499.9995
     county2 |          0

by Jean Roth , jroth@nber.org , 29 Mar 2016