Frequencies for first 10,000 rows of cntynat variable in natl2001 dataset :

  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        284        2.84        2.84
      01037 |      2,489       24.89       27.73
      01045 |        736        7.36       35.09
      01049 |      1,223       12.23       47.32
      01051 |        942        9.42       56.74
      01052 |        316        3.16       59.90
      01063 |        497        4.97       64.87
      01999 |      3,513       35.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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