Human population density (in the year 2000) within the contiguous 48 United States.
A data frame with 48 observations on the following 4 variables.
a categorical vector, each state's name
a numeric vector, each state's area
a numeric vector, each state's population using the 2000 Census Bureau estimate
a factor, each state's region
Willmott, C. J., S. M. Robeson, and K. Matsuura, 2007. Geographic box plots. Physical Geography, 28, 331-344, DOI: 10.2747/0272-3622.214.171.1241.
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