Frequencies for first 10,000 rows of cntynat variable in natl1992 dataset :

NCHS County |
         of |
  Occurence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        237        2.37        2.37
      01028 |        243        2.43        4.80
      01037 |      2,530       25.30       30.10
      01045 |        848        8.48       38.58
      01049 |      1,376       13.76       52.34
      01051 |      1,021       10.21       62.55
      01063 |        405        4.05       66.60
      01999 |      3,340       33.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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