A data set containing the 2009 unemployment data in the USA by
 county.
     
    
    
    
    A data frame with 3218 rows and 8 variables:
- id
- the county ID number 
- state_fips
- the state FIPS number 
- county_fips
- the county FIPS number 
- name
- the county name 
- year
- the year 
- rate
- the unemployment rate 
- county
- the county abbreviated name 
- state
- the state acronym