R/data-tips.R

In OpenIntroStat/openintro-r-package: Data Sets and Supplemental Functions from 'OpenIntro' Textbooks and Labs

#' Tip data
#'
#' A simulated data set of tips over a few weeks on a couple days per week.
#' Each tip is associated with a single group, which may include several bills
#' and tables (i.e. groups paid in one lump sum in simulations).
#'
#' This data set was built using simulations of tables, then bills, then tips
#' based on the bills. Large groups were assumed to only pay the gratuity,
#' which is evident in the data. Tips were set to be plausible round values;
#' they were often (but not always) rounded to dollars, quarters, etc.
#'
#' @name tips
#' @docType data
#' @format A data frame with 95 observations on the following 5 variables.
#' \describe{
#'   \item{week}{Week number.}
#'   \item{day}{Day, either \code{Friday} or \code{Tuesday}.}
#'   \item{n_peop}{Number of people associated with the group.}
#'   \item{bill}{Total bill for the group.}
#'   \item{tip}{Total tip from the group.}
#'   }
#' @source Simulated data set.
#' @keywords datasets
#' @examples
#'
#' library(ggplot2)
#'
#' ggplot(tips, aes(x = day, y = tip)) +
#'   geom_boxplot()
#'
#' ggplot(tips, aes(x = tip, fill = factor(week))) +
#'   geom_density(alpha = 0.5) +
#'   labs(x = "Tip", y = "Density", fill = "Week")
#'
#' ggplot(tips, aes(x = tip)) +
#'   geom_dotplot()
#'
#' ggplot(tips, aes(x = tip, fill = factor(day))) +
#'   geom_density(alpha = 0.5) +
#'   labs(x = "Tip", y = "Density", fill = "Day")
"tips"