Frequencies for first 10,000 rows of urbanrur variable in nhamcsopd2007 dataset :

            urban-rural |
      classification of |
          patient's zip |      Freq.     Percent        Cum.
------------------------+-----------------------------------
           missing data |        201        2.01        2.01
    large central metro |      2,964       29.64       31.65
     large fringe metro |      2,036       20.36       52.01
           medium metro |      3,370       33.70       85.71
            small metro |        465        4.65       90.36
micropolitan (nonmetro) |        964        9.64      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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