Frequencies for first 10,000 rows of cntynat variable in natlterr1995 dataset :

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      52011 |      1,375       13.75       13.75
      52013 |        919        9.19       22.94
      52016 |        408        4.08       27.02
      52050 |        909        9.09       36.11
      52058 |      1,180       11.80       47.91
      52065 |      2,178       21.78       69.69
      52999 |      3,031       30.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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