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

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        357        3.57        3.57
      01037 |      2,466       24.66       28.23
      01045 |        822        8.22       36.45
      01049 |        602        6.02       42.47
      01051 |      1,070       10.70       53.17
      01052 |        236        2.36       55.53
      01063 |        435        4.35       59.88
      01999 |      4,012       40.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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