Summary statistics for gaz1990zipcodedistance500miles dataset :

by Jean Roth , jroth@nber.org , 1 Apr 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     fipsst1 |          0
    zipcode1 |          0
mi_to_zipc~e |218,759,050    304.8725    125.6378   .0538119        500
     fipsst2 |          0
    zipcode2 |          0
-------------+---------------------------------------------------------
        name |          0

by Jean Roth , jroth@nber.org , 1 Apr 2016