Frequencies for statefips variable in countywi2007 dataset :

  The State |
    Federal |
Information |
 Processing |
     System |
(FIPS) code |      Freq.     Percent        Cum.
------------+-----------------------------------
         55 |         73      100.00      100.00
------------+-----------------------------------
      Total |         73      100.00

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