Variables:
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icpsr
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integer, numeric code for state used by the Inter-university Consortium for Political and Social Research
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state
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character, name of state or Washington D.C.
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year
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numeric or NA, year of statehood
Details
The function readKH converts the integer ICPSR codes into strings, via a table lookup in this data frame. Another table lookup in state.abb provides the 2-letter abbreviation commonly used in identifying American legislators, e.g., KENNEDY, E (D-MA).