femsmoke: Mortality due to smoking according age group in women
Description
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.source
D. Appleton, J. French, M. Vanderpump (1996) "Ignoring a Covariate: An
Example of Simpson's Paradox" American Statistician, 50, 340-341