Summary statistics for sf12010countydistance50miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     county1 |          0
mi_to_county |     38,792    34.30748    10.31771   1.407852   49.99963
     county2 |          0

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