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.
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+