data(state)
state.abb: character vector of 2-letter abbreviations
for the state names.
state.area: numeric vector of state areas (in square
miles).
state.center: list with components named x and
y giving the approximate geographic center of each state in
negative longitude and latitude. Alaska and Hawaii are placed just
off the West Coast.
state.division: factor giving state divisions (New
England, Middle Atlantic, South Atlantic, East South Central, West
South Central, East North Central, West North Central, Mountain, and
Pacific).
state.name: character vector giving the full state
names
state.region: factor giving the region (Northeast,
South, North Central, West) that each state belongs to.
state.x77: matrix with 50 rows and 8 columns giving
the following statistics in the respective columns.
Population: population estimate as of July 1, 1975
Income: per capita income (1974)
Illiteracy: illiteracy (1970, percent of population)
Life Exp: life expectancy in years (1969㫟)
Murder: murder and non-negligent manslaughter rate
per 100,000 population (1976)
HS Grad: percent high-school graduates (1970)
Frost: mean number of days with minimum temperature
below freezing (1931) in capital or large city
Area: land area in square miles
U.S. Department of Commerce, Bureau of the Census (1977). County and City Data Book.