Frequencies for first 10,000 rows of urbanrur variable in namcs2009 dataset :

  urban-rural classification of |
                  patient's zip |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                   missing data |        319        3.19        3.19
            large central metro |      2,826       28.26       31.45
             large fringe metro |      2,088       20.88       52.33
                   medium metro |      2,362       23.62       75.95
                    small metro |        764        7.64       83.59
micropolitan/noncore (nonmetro) |      1,641       16.41      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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