Frequencies for first 10,000 rows of cityres variable in natl1973 dataset :

  NCHS City |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
        012 |          2        0.02        0.02
        021 |      1,021       10.21       10.23
        063 |          2        0.02       10.25
        066 |          1        0.01       10.26
        069 |          1        0.01       10.27
        096 |          2        0.02       10.29
        180 |          2        0.02       10.31
        294 |          2        0.02       10.33
        357 |          1        0.01       10.34
        471 |          1        0.01       10.35
        999 |      8,965       89.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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