Frequencies for first 10,000 rows of cityres variable in natl1992 dataset :

  NCHS City |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        004 |          2        0.02        0.02
        008 |        770        7.70        7.72
        021 |        472        4.72       12.44
        023 |        663        6.63       19.07
        024 |        598        5.98       25.05
        032 |          1        0.01       25.06
        086 |          1        0.01       25.07
        094 |          1        0.01       25.08
        194 |          1        0.01       25.09
        999 |      7,490       74.90       99.99
        ZZZ |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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