Summary statistics for sf12010placedistance500miles dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
      state1 |          0
      place1 |          0
 mi_to_place |202,476,650    305.7147     126.183   .0648001        500
      state2 |          0
      place2 |          0

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