Summary statistics for sf12000countydistance50miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     county1 |          0
mi_to_county |     39,568    34.13068    10.54829   .9607159   49.99893
     county2 |          0

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