Frequencies for first 10,000 rows of cityres variable in natl1995 dataset :

  NCHS City |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        006 |          1        0.01        0.01
        008 |        681        6.81        6.82
        012 |          3        0.03        6.85
        023 |        409        4.09       10.94
        025 |          1        0.01       10.95
        028 |        265        2.65       13.60
        029 |        617        6.17       19.77
        240 |          1        0.01       19.78
        999 |      8,021       80.21       99.99
        ZZZ |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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