In a study of anxiety disorders, anxiety levels were first measured during a 3 m
ID: 3448905 • Letter: I
Question
In a study of anxiety disorders, anxiety levels were first measured during a 3 month, no treatment baseline period, and then during a 3 month treatment period. Participants with more severe symptoms tended to drop out of the study during the baseline period. Is this Self-selection bias, Survivorship bias, or under coverage bias? In a study of anxiety disorders, anxiety levels were first measured during a 3 month, no treatment baseline period, and then during a 3 month treatment period. Participants with more severe symptoms tended to drop out of the study during the baseline period. Is this Self-selection bias, Survivorship bias, or under coverage bias?Explanation / Answer
The above case can be explained better as undercoverage bias because some people with more severe symptoms tended to drop out. It can because those members of the population may be inadequately represented in the sample.