Smoking and Alzheimer's Disease

Description

A case-control study of smoking and Alzheimer's disease.

Usage

data("alzheimer")

Format

A data frame with 538 observations on the following 3 variables.

smoking

a factor at levels None, <10, 10-20 and >20 (cigarettes per day).

disease

a factor at levels Alzheimer, Other dementias and Other diagnoses.

gender

a factor at levels Female and Male.

Details

198 cases of Alzheimer's disease are compared to a control group with respect to smoking history. The data are published in Table 4 (Salib \& Hillier, 1997).

Source

Emad Salib \& Valerie Hillier (1997). A case-control study of smoking and Alzheimer's disease, International Journal of Geriatric Psychiatry 12, 295–300.

Torsten Hothorn, Kurt Hornik, Mark A. van de Wiel \& Achim Zeileis (2006). A Lego system for conditional inference, The American Statistician, 60(3), 257–263.

Examples

  ### spineplots
  layout(matrix(1:2, ncol = 2))
  spineplot(disease ~ smoking, data = alzheimer, subset = gender == "Male",
            main = "Male")
  spineplot(disease ~ smoking, data = alzheimer, subset = gender == "Female",
            main = "Female")

  ### Cochran-Mantel-Haenszel test
  cmh_test(disease ~ smoking | gender, data = alzheimer)