Frequencies for first 10,000 rows of urbanrur variable in nhamcsopd2008 dataset :

            urban-rural |
      classification of |
     patient's zip code |      Freq.     Percent        Cum.
------------------------+-----------------------------------
           missing data |        228        2.28        2.28
    large central metro |      3,018       30.18       32.46
     large fringe metro |      2,334       23.34       55.80
           medium metro |      2,373       23.73       79.53
            small metro |        445        4.45       83.98
micropolitan (nonmetro) |      1,602       16.02      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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