Frequencies for first 10,000 rows of urbanrur variable in nhamcsopd2009 dataset :

       recoded nchs urban-rural |
classification of patient's zip |
                           code |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                   missing data |        303        3.03        3.03
            large central metro |      4,266       42.66       45.69
             large fringe metro |      2,037       20.37       66.06
                   medium metro |      1,768       17.68       83.74
                    small metro |        383        3.83       87.57
micropolitan/noncore (nonmetro) |      1,243       12.43      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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