Frequencies for first 10,000 rows of urbanrur variable in namcs2010 dataset :

  urban-rural classification of |
                  patient's zip |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                   missing data |        360        3.60        3.60
            large central metro |      2,757       27.57       31.17
             large fringe metro |      2,287       22.87       54.04
                   medium metro |      2,022       20.22       74.26
                    small metro |        821        8.21       82.47
micropolitan/noncore (nonmetro) |      1,753       17.53      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016