Which of the following is true about longitudinal studies?
A) The potential for cohort effects makes them difficult to interpret.
B) They are generally cheaper than cross-sectional studies.
C) They typically only take a few weeks to perform.
D) They are more likely to suffer from attrition than cross-sectional studies.
Answer: D
Rationale: Because longitudinal studies can last for years or decades, they can be hampered by the issues of time, money, and attrition, which occurs when participants stop returning mail or phone calls, become ineligible, or otherwise quit participating. Unlike cross-sectional studies however, longitudinal studies do not suffer from the issue of cohort effects.
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