posted by Dianna .
Indicate how the bias would affect the measure of association. Would it be under estimated, or over estimated or unchanged.
Persons diagnosed as HIV positive or negative were interviewed about their number of lifetime sexual partners. The interview occurred after they were told their HIV status.
2. A cohort study looked at the association of exposure to PCBs in the workplace and the occurrence of cancer over 20 years. At the 10-year follow up, 15% of the original participants could not be located to assess their disease status.
3. In a clinical trial of a new drug, the intervention group reviewed the medicine and outcomes were assessed by a doctor working for the pharmaceutical company. The placebo group received the placebo and outcomes were assessed by a doctor from the local community hospital.
What kind of HELP do you need? You need to be specific when asking questions here.
If all you do is post your entire assignment, with no evidence of thinking on your part, nothing will happen since no one here will do your work for you. But if you are specific about what you don't understand about the assignment or exactly what help you need, someone might be able to assist you.