Frequencies for first 10,000 rows of cityres variable in natl1994 dataset :

  NCHS City |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        008 |        722        7.22        7.22
        017 |          1        0.01        7.23
        023 |        449        4.49       11.72
        026 |         24        0.24       11.96
        028 |        476        4.76       16.72
        029 |        626        6.26       22.98
        041 |          1        0.01       22.99
        999 |      7,699       76.99       99.98
        ZZZ |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015