#' Plants
#'
#' Data on plants and the states in the US and Canada they occur in.
#'
#' @format A [list] with 33,721 plants, each containing a character vector
#' listing the states in the US and Canada in which they occur. The names in
#' the list specify the species or genus of the plant.
#'
#' @source USDA, NRCS. 2008. The PLANTS Database (<http://plants.usda.gov/>, 31
#' December 2008). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
#' @source Dua, D. and Karra Taniskidou, E. (2017). UCI Machine Learning
#' Repository <http://archive.ics.uci.edu/ml/>. Irvine, CA: University of
#' California, School of Information and Computer Science.
"plants"
#' Fruits
#'
#' A synthethic data set of preferences for fruits and their overlaps,
#' generated only to be a showcase for the examples for this package.
#'
#' @format A [data.frame] with 100 observations of 5 variables:
#' \describe{
#' \item{banana}{whether the person likes bananas, a logical}
#' \item{apple}{whether the person likes apples, a logical}
#' \item{orange}{whether the person likes oranges, a logical}
#' \item{sex}{the sex of the person, a factor with levels 'male' and 'female'}
#' \item{age}{the age of the person, a factor with levels 'child' and 'adult'}
#' }
"fruits"
#' Organisms
#'
#' Example data from the **VennMaster** package.
#'
#' Note that this data is difficult to fit using an Euler diagram, even
#' if we use ellipses, which is clear if one chooses to study the various
#' overlaps in the resulting diagrams.
#'
#' @format A [matrix] with 7 observations, consisting of various organisms,
#' and 5 variables: *animal, mammal, plant, sea*, and, *spiny*,
#' indicating whether the organism belongs to the category or not.
#'
#' @source <https://github.com/sysbio-bioinf/VennMaster/blob/master/data_examples/deploy/example1.list>
"organisms"
#' Pain distribution data
#'
#' Data from a study on pain distribution for patients with
#' persistent neck pain in relation to a whiplash trauma.
#'
#' @section Disclaimer:
#' Note that the maintainer of this package is an author of the source for
#' this data.
#'
#' @format A flat [table] (cross-table) with with sex in columns and
#' pain distribution in rows and integer counts making up the cells of the
#' table.
#'
#' @source Westergren H, Larsson J, Freeman M, Carlsson A, Jöud A,
#' Malmström E-M. Sex-based differences in pain distribution in a cohort of
#' patients with persistent post-traumatic neck pain. Disability and
#' Rehabilitation. 2017 Jan 27
"pain"
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