Frequencies for first 10,000 rows of cntynat variable in natl2000 dataset :

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        305        3.05        3.05
      01037 |      2,341       23.41       26.46
      01045 |        755        7.55       34.01
      01049 |      1,215       12.15       46.16
      01051 |      1,015       10.15       56.31
      01052 |        321        3.21       59.52
      01063 |        518        5.18       64.70
      01999 |      3,530       35.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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