Definitions

Question 1

Define bias?

Answer 1

A systematic error that results in a deviation from the true effect of an exposure on an outcome

Question 2

What is selection bias?

Answer 2

Selection of a study population that is not truly representative to the population

Or allocating participants to groups in a non-random way

Question 3

What is information bias?

Answer 3

Measurement bias

Observer bias

Recall bias: past events not being recalled correctly

Reporting bias: not reporting truth

Publication bias: negative results not being published