Frequencies for first 10,000 rows of urbanrur variable in nhamcsed2009 dataset :

       nchs |
urban-rural |
classificat |
     ion of |
  patient's |
   zip code |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |        506        5.06        5.06
          1 |      3,337       33.37       38.43
          2 |      1,840       18.40       56.83
          3 |      2,560       25.60       82.43
          4 |        661        6.61       89.04
          5 |      1,096       10.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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