Frequencies for first 10,000 rows of cntyres variable in natlterr2000 dataset :

NCHS County |
         of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
      52011 |        585        5.85        5.85
      52013 |        402        4.02        9.87
      52016 |        479        4.79       14.66
      52050 |        228        2.28       16.94
      52058 |        474        4.74       21.68
      52065 |      1,042       10.42       32.10
      52999 |      6,790       67.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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