Frequencies for first 10,000 rows of cntynat variable in natlterr1997 dataset :

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      52011 |      1,353       13.53       13.53
      52013 |        770        7.70       21.23
      52016 |        329        3.29       24.52
      52050 |        791        7.91       32.43
      52058 |      1,212       12.12       44.55
      52065 |      2,214       22.14       66.69
      52999 |      3,331       33.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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