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

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        325        3.25        3.25
      01037 |      2,319       23.19       26.44
      01045 |        878        8.78       35.22
      01049 |      1,009       10.09       45.31
      01051 |      1,038       10.38       55.69
      01052 |        175        1.75       57.44
      01063 |        448        4.48       61.92
      01999 |      3,808       38.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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