Summary statistics for sf12000countydistance2500miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     county1 |          0
     county2 |          0
mi_to_county | 10,332,604    941.4908     627.428   .9607159   4023.252
 countyname1 |          0
 countyname2 |          0

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