Mortality due to smoking according age group in women
In 1972-74, a survey of one in six residents of Whickham, near Newcastle, England was made. Twenty years later, this data recorded in a follow-up study. Only women who are current smokers or who have never smoked are included.
data(femsmoke)
A data frame with 28 observations on the following 4 variables.
observed count for given combination
a factor with levels yes no
a factor with levels yes no
a factor with agegroup levels 18-24 25-34 35-44 45-54 55-64 65-74 75+
D. Appleton, J. French, M. Vanderpump (1996) "Ignoring a Covariate: An Example of Simpson's Paradox" American Statistician, 50, 340-341
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