Frequencies for fipscounty variable in countyak2005 dataset :

FIPS County |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
      02000 |          1        3.57        3.57
      02013 |          1        3.57        7.14
      02016 |          1        3.57       10.71
      02020 |          1        3.57       14.29
      02050 |          1        3.57       17.86
      02060 |          1        3.57       21.43
      02068 |          1        3.57       25.00
      02070 |          1        3.57       28.57
      02090 |          1        3.57       32.14
      02100 |          1        3.57       35.71
      02110 |          1        3.57       39.29
      02122 |          1        3.57       42.86
      02130 |          1        3.57       46.43
      02150 |          1        3.57       50.00
      02164 |          1        3.57       53.57
      02170 |          1        3.57       57.14
      02180 |          1        3.57       60.71
      02185 |          1        3.57       64.29
      02188 |          1        3.57       67.86
      02201 |          1        3.57       71.43
      02220 |          1        3.57       75.00
      02232 |          1        3.57       78.57
      02240 |          1        3.57       82.14
      02261 |          1        3.57       85.71
      02270 |          1        3.57       89.29
      02280 |          1        3.57       92.86
      02282 |          1        3.57       96.43
      02290 |          1        3.57      100.00
------------+-----------------------------------
      Total |         28      100.00

by Jean Roth , jroth@nber.org , 26 Jun 2017