Summary statistics for zipcode1990 dataset :

by Jean Roth , jroth@nber.org , 30 Mar 2016

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
      fipsst |          0
     zipcode |     29,470    49611.65     27018.6       1001      99950
      stabbr |          0
 zipcodename |          0
         lon |     29,470     90.8919    14.75744   67.00739     176.31
-------------+---------------------------------------------------------
         lat |     29,470    39.00796    5.151075   19.06684   71.23463
     pop1990 |     29,470    8439.426     12315.6          0     112047
       alloc |     29,470    .0017306    .0040264          0    .103681

by Jean Roth , jroth@nber.org , 30 Mar 2016