Bias (+ Confounding?)
Fragment of a discussion from Course talk:STAT 550
1. Response bias - the design of the survey, e.g., wording of questions, may suggest a favoured response. 2. Non-response bias - a survey generally does not receive responses from everyone. The problem is that in some cases those who respond are quite different from those who do not respond. 3. Observer bias - researchers know the objective of the study and allow this knowledge to influence their actions or observations during the study.