Summary statistics for gaz1990zipcodecentroid dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
      fipsst |          0
     zipcode |          0
    intptlon |     29,470     90.8919    14.75744   67.00739     176.31
    intptlat |     29,470    39.00796    5.151075   19.06684   71.23463

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