R/Birdkeepers.R

In LSTbook: Data and Software for "Lessons in Statistical Thinking"

#' Birdkeeping and Lung Cancer
#'
#' A 1972--1981 health survey in The Hague, Netherlands, discovered an
#' association between keeping pet birds and increased risk of lung
#' cancer.  To investigate birdkeeping as a risk factor, researchers
#' conducted a \emph{case--control} study of patients in 1985 at four
#' hospitals in The Hague (population 450,000).  They identified 49 cases
#' of lung cancer among the patients who were registered with a general
#' practice, who were age 65 or younger and who had resided in the city
#' since 1965.  They also selected 98 controls from a population of
#' residents having the same general age structure.
#'
#' This dataset is copied and renamed from the Sleuth3 R package, where it is called case2002.
#'
#' @docType data
#'
#' @usage data(Birdkeepers)
#'
#' @format  A data frame with 147 observations on the following 7 variables.
#' - LC Whether subject has lung cancer
#' - FM Sex of subject
#' - SS Socioeconomic status, determined by occupation of the household's principal wage earner
#' - BK Indicator for birdkeeping (caged birds in the home for more that 6 consecutive months from 5 to 14 years before diagnosis (cases) or examination (control))
#' - AG Age of subject (in years)
#' - YR Years of smoking prior to diagnosis or examination
#' - CD Average rate of smoking (in cigarettes per day)
#'
#' @keywords datasets
#'
#' @source Ramsey, F.L. and Schafer, D.W. (2013). *The Statistical Sleuth: A
#' Course in Methods of Data Analysis (3rd ed)*, Cengage Learning.
#'
#' @references Holst, P.A., Kromhout, D. and Brand, R. (1988).  "For Debate: Pet Birds
#' as an Independent Risk Factor for Lung Cancer" *British Medical Journal* **297**: 13--21.
"Birdkeepers"