Data from a questionaire on the benefits of mammography.
data(mammoexp)A data frame with 412 observations on the following 6 variables.
Mammograph experience, an ordered factor with 
              levels Never < Within a Year < Over a Year
Agreement with the statement: 
                 `You do not need a mamogram unless you develop symptoms.' 
                 A factor with levels Strongly Agree, Agree,
                 Disagree and Strongly Disagree
Perceived benefit of mammography, the sum of five scaled responses, each on a four point scale. A low value is indicative of a woman with strong agreement with the benefits of mammography.
Mother or Sister with a history 
                 of breast cancer; a factor with levels No and
                 Yes.
Answers to the question: 
               `Has anyone taught you how to examine your own breasts?'
               A factor with levels No and Yes.
Answers to the question: 
                `How likely is it that a mammogram
                could find a new case of breast cancer?'
                An ordered factor with levels Not likely < 
                Somewhat likely < Very likely.