Frequencies for countyfips variable in countyct1999 dataset :

    3-digit |
County FIPS |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |          1       11.11       11.11
        001 |          1       11.11       22.22
        003 |          1       11.11       33.33
        005 |          1       11.11       44.44
        007 |          1       11.11       55.56
        009 |          1       11.11       66.67
        011 |          1       11.11       77.78
        013 |          1       11.11       88.89
        015 |          1       11.11      100.00
------------+-----------------------------------
      Total |          9      100.00

by Jean Roth , jroth@nber.org , 23 Jun 2017