#' Shorthand names for selected colors from RColorBrewer
#'
#' This dataset provides convenient access to selected ColorBrewer palettes:
#' diverging brown-bluegreen (BrBG) with 8 levels; diverging purple-green (PRGn)
#' with 8 levels; and sequential gray (Greys) with the middle four of 6 levels.
#'
#' The color names have the form "level_hue" with 4 saturation levels (dark, mid,
#' light, pale) and 5 hues (Br, BG, PR, Gn, Gray or Grey).
#'
#' @format A data frame with columns:
#' \describe{
#' \item{rcb_name}{Character variable of names.}
#' \item{rcb_code}{Character variable of hex color codes.}
#' }
#' @source Cynthia Brewer (\url{http://colorbrewer2.org}) and RColorBrewer (\url{https://cran.r-project.org/package=RColorBrewer}).
#' @examples
#' rcb_colors
#' rcb("dark_Br")
#' rcb("light_Gn")
"rcb_colors"
#' Visit duration at museum exhibitions
#'
#' A data set of how much time visitors spend viewing museum exhibits.
#'
#' These data are simulated to approximate the data shown in Figure 4.10 in
#' Robbins (2013). The original data were not readily available.
#'
#' @format A tidy data frame (tibble) with 588 observations and 2 variables.
#' An observation is a unique person at an exhibit.
#'
#' \describe{
#' \item{exhibit}{Name of the exhibition}
#' \item{minutes}{Number of minutes a unique person spent viewing the exhibit}
#' }
#' @source \code{r-graph-catalog} by Joanna Zhao and Jenny Bryan, https://github.com/jennybc/r-graph-catalog
#' @examples
#' data(museum_exhibits, package = "graphclassmate")
#' museum_exhibits
"museum_exhibits"
#' Nontraditional and traditional undergraduates
#'
#' A data set of the number of years that traditional and nontraditional
#' students were enrolled at the US institutions from which they graduated.
#'
#' These data are subset of MIDFIELD data. All students were enrolled at least
#' one term in an engineering program. All students graduated though not
#' necessarily in engineering.
#'
#' The data subset excludes the 10th and 90th deciles of years enrolled.
#'
#' @format A tidy data frame (tibble) with 269,057 observations and 5 variables.
#' An observation is a unique student.
#'
#' \describe{
#' \item{sex}{Student sex (Female or Male)}
#' \item{race}{Student race or ethnicity (Asian, Black, Hispanic, or White)}
#' \item{path}{Student path through curriculum (Nontraditional or Traditional)}
#' \item{SAT}{Student SAT score at matriculation}
#' \item{enrolled}{Number of years student enrolled at the institution from which they graduate}
#' }
#' @source MIDFIELD https://engineering.purdue.edu/MIDFIELD
#' @examples
#' data(nontraditional, package = "graphclassmate")
#' nontraditional
"nontraditional"
#' Population in the NY metro area
#'
#' A data set of population in the New York metropolitan area by county and
#' race/ethnicity from the 2000 census.
#'
#' These data are taken from section 8.5 in Robbins (2013).
#'
#' @format A tidy data frame (tibble) with 60 observations and 3 variables.
#' An observation is the population in a county by race/ethnicity.
#'
#' \describe{
#' \item{race}{Race or ethnicity}
#' \item{county}{Name of county}
#' \item{population}{Number of residents from the 2000 US census}
#' }
#' @source \code{r-graph-catalog} by Joanna Zhao and Jenny Bryan, https://github.com/jennybc/r-graph-catalog
#' @examples
#' data(metro_pop, package = "graphclassmate")
#' metro_pop
"metro_pop"
#' Student admissions at UC Berkeley
#'
#' A data set on applicants to graduate school at University of California,
#' Berkeley, for the six largest departments in 1973.
#'
#' These data are based on the \code{UCBAdmissions} data in base R. The new
#' variable \code{applied} is the sum of the number of students admitted and
#' the number of students rejected by each department.
#'
#' @format A tidy data frame (tibble) with 12 observations and 4 variables.
#' An observation, by sex and department, records the number of people
#' who applied and the number admitted.
#'
#' \describe{
#' \item{sex}{Sex of applicant, Female or Male}
#' \item{dept}{Department A through F}
#' \item{admitted}{Number admitted to the department}
#' \item{applied}{Number of applicants to the department}
#' }
#' @source Base R.
#' @examples
#' data(ucb_admit, package = "graphclassmate")
#' ucb_admit
"ucb_admit"
#' Infant mortality in the US, 2007-2016
#'
#' CDC records on birth and infant death in the US from 2007 to 2016.
#'
#' The CDC data set includes US counties encoded by the 5-digit Federal
#' Information Processing Specification (FIPS) county codes--codes that were
#' superseded in 2009 by the INCITS 31 codes.
#'
#' County-level data are shown only for counties with populations of 250,000
#' or more. Because of population changes, data is not available for all
#' counties in all years.
#'
#' Race/ethnicity data are grouped and summarized into 5 levels: Amerind for
#' indigenous peoples excluding Native Hawaiians, Asian/PI for people of Asian
#' and Pacific Islander descent, Black for African Americans, Hispanic for
#' people of Latin American descent, and White.
#'
#' @format A tidy data frame (tibble) with 12,120 observations and 6 variables.
#'
#' \describe{
#' \item{region}{Geographical regions of the US as denoted by the federal
#' census: CENS-R1 (Northeast), CENS-R2 (Midwest), CENS-R3 (South),
#' and CENS-R4 (West).}
#' \item{county_id}{US counties encoded by a 5-digit number (FIPS code) which
#' uniquely identifies counties and county equivalents.}
#' \item{race}{Race or ethnicity: Amerind, Asian/PI, Black, Hispanic, White.}
#' \item{age}{Age group of the mother: 15, 15-19, 20-24, 25-29, 30-34, 35-39,
#' 40-44, 45-49. These bins were selected by the CDC.}
#' \item{deaths}{The number of deaths of infants less than a year old,
#' 2007--2016.}
#' \item{births}{The number of births, 2007--2016.}
#' }
#'
#' @source US Centers for Disease Control and Prevention (CDC) WONDER online
#' database, https://wonder.cdc.gov/controller/datarequest/D69
#' @examples
#' data(infant_mortality, package = "graphclassmate")
#' infant_mortality
"infant_mortality"
#' Median income by US county in 2016
#'
#' American Community Survey (ACS) median income in the past 12 months
#' in constant 2016 dollars.
#'
#' Source: ACS Table B07011 "Median income in the past 12 months by
#' geographic mobility in the past year for current residence in the US."
#' Population 15 years and older in the US with income.
#'
#' @format A tidy data frame (tibble) with 816 observations and 4 variables.
#'
#' \describe{
#' \item{county_id}{US counties encoded by a 5-digit number (FIPS code) which
#' uniquely identifies 816 counties and county equivalents}
#' \item{county}{Name of the county or county equivalent}
#' \item{state}{US states and the District of Columbia}
#' \item{income}{Median income over the past 12 months}
#' }
#'
#' @source ACS Table B07011, ACS_05_EST_B07011
#' @examples
#' data(county_income, package = "graphclassmate")
#' county_income
"county_income"
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