Frequencies for first 10,000 rows of cityres variable in natl1983 dataset :

  NCHS City |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        004 |          2        0.02        0.02
        008 |        755        7.55        7.57
        010 |          3        0.03        7.60
        021 |        404        4.04       11.64
        023 |        548        5.48       17.12
        024 |        425        4.25       21.37
        047 |          1        0.01       21.38
        121 |          1        0.01       21.39
        999 |      7,861       78.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016