Frequencies for first 10,000 rows of cntocfip variable in natl1993 dataset :

  County of |
 Occurrence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
      01015 |        350        3.50        3.50
      01055 |        224        2.24        5.74
      01073 |      2,311       23.11       28.85
      01089 |        778        7.78       36.63
      01097 |      1,109       11.09       47.72
      01101 |      1,090       10.90       58.62
      01125 |        303        3.03       61.65
      01999 |      3,835       38.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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