Observational studies, such as cohort and case-control studies, are subject to some limitations, such as selection bias and recall bias. Define these two biases and provide at least one example of a way each bias can be minimized.
What will be an ideal response?
Ans: Selection bias results due to systematic errors in differences in the characteristics of those who are selected to participate and those who are not, or in the characteristics of those who choose to participate and those who do not. Selection bias can be minimized through randomization or through careful selection of a comparison group. Recall bias is a type of information bias that occurs due to differential or inaccurate recollection of a past exposure or experience. Recall bias can be minimized by keeping the period of time from exposure to recall short, or by using pretested standardized questionnaires.
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