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state - State name.
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abbr - State abbreviation (e.g. "MN").
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fips - FIPS code.
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pop2010 - Population in 2010.
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pop2000 - Population in 2000.
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homeownership - Homeownership rate.
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multiunit - Percent of living units that are in multi-unit structures.
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income - Average income per capita.
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med_income - Median household income.
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poverty - Poverty rate.
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fed_spend - Federal spending per capita.
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land_area - Land area.
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smoke - Percent of population that smokes.
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murder - Murders per 100,000 people.
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robbery - Robberies per 100,000.
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agg_assault - Aggravated assaults per 100,000.
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larceny - Larcenies per 100,000.
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motor_theft - Vehicle theft per 100,000.
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soc_sec - Percent of individuals collecting social security.
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nuclear - Percent of power coming from nuclear sources.
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coal - Percent of power coming from coal sources.
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tr_deaths - Traffic deaths per 100,000.
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tr_deaths_no_alc - Traffic deaths per 100,000 where alcohol was not a factor.
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unempl - Unemployment rate (February 2012, preliminary).