Frequencies for first 10,000 rows of urbanrur variable in nhamcsed2007 dataset :

            urban-rural |
      classification of |
     patient's zip code |      Freq.     Percent        Cum.
------------------------+-----------------------------------
           missing data |        428        4.28        4.28
    large central metro |      3,010       30.10       34.38
     large fringe metro |      1,361       13.61       47.99
           medium metro |      2,936       29.36       77.35
            small metro |        838        8.38       85.73
micropolitan (nonmetro) |      1,427       14.27      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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