Biases Flashcards
Volunteers are different
Volunteer bias
Those who can work are typically healthier
Healthy worker effect
People who seek preventative treatment are more proactive about their health
Healthy user effect
Difference in how users are assigned to treatment and comparison groups
Allocation bias
Both the exposure and the disease under study affect selection
Berksonian bias
Subjects responding inaccurately because of dislike
Response bias
Subjects don’t recall events correctly
Recall bias
The interviewer asks questions in a manner that skew the response of the subject, based on preconceived notions
Interviewer bias
Modification of behavior in response to knowledge that they are being watched
Hawthorne effect
Tendency of subjects to respond in ways that make them seem socially acceptable
Social desirability bias
Caused by some groups being more likely to leave studies than others
Attrition bias
The observer’s tendency to see what they expect to see
Observer bias
What are the 2 main biases in studies?
Selection and Information bias
If someone knows they are being observed, what kind of bias could occur?
Hawthorne Effect
If people voluntarily participate in the study, what bias would be introduced?
Volunteer bias
