Frequencies for first 10,000 rows of cntynat variable in natl2002 dataset :

  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01037 |         74        0.74        0.74
      01045 |          8        0.08        0.82
      01049 |          5        0.05        0.87
      01051 |         15        0.15        1.02
      01052 |          1        0.01        1.03
      01063 |          8        0.08        1.11
      01999 |         44        0.44        1.55
      02003 |      5,360       53.60       55.15
      02999 |      4,485       44.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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