Frequencies for first 10,000 rows of urbanrur variable in namcs2007 dataset :

  urban-rural classification of |
                  patient's zip |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                   missing data |        433        4.33        4.33
            large central metro |      2,467       24.67       29.00
             large fringe metro |      2,296       22.96       51.96
                   medium metro |      2,114       21.14       73.10
                    small metro |        849        8.49       81.59
micropolitan/noncore (nonmetro) |      1,841       18.41      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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