CONTENTS - Department of Mathematics and Statistics - University ...

e.g. the relative risk of melanoma for a
farmer compared with an office worker.
Here, the prevalence of melanoma
among farmers is divided by the
prevalence among office workers. This
will show if there is any association
between prevalence of melanoma and
occupation after an appropriate analysis
by essentially comparing the two
groups.
4. Other types of response data
• Scores (direct measurement not possible;
instead a patient is assessed on several
subjective scales then the values on each
are added to give a score for a patient)
e.g. 30 questions on a health survey. A
respondent gives values 0 to 3 on each
question then score out of 90 given. This
total has convenient properties whereas
individual values may not.
• Patients assess their degree of low back
pain after treatment on scale 1 (no pain) to
5 (unbearable pain).
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Section 1