What is a major advantage of cross-sectional designs?

What is a major advantage of cross-sectional designs?

• A. They are efficient and not affected by selective attrition or practice effects.
• B. They allow detailed tracking of individuals over time.
• C. They are unaffected by cohort effects.
• D. They require long-term observation.

Answer: (A)

Cross-sectional designs compare people of different ages at one point in time. Their main strength is efficiency: you can collect data quickly and with less cost because you’re not following the same individuals for years. Because you don’t test the same participants repeatedly, there’s little risk of selective attrition (people dropping out) or practice effects (getting better at the test just from repeated exposure). That’s why this design is often favored when speed and practicality matter. Keep in mind, though, that differences between age groups can reflect historical or cultural differences (cohort effects) rather than true developmental change. Tracking individuals over time and long-term observation describe longitudinal approaches, which are not features of cross-sectional designs.

Cross-sectional designs compare people of different ages at one point in time. Their main strength is efficiency: you can collect data quickly and with less cost because you’re not following the same individuals for years. Because you don’t test the same participants repeatedly, there’s little risk of selective attrition (people dropping out) or practice effects (getting better at the test just from repeated exposure). That’s why this design is often favored when speed and practicality matter. Keep in mind, though, that differences between age groups can reflect historical or cultural differences (cohort effects) rather than true developmental change. Tracking individuals over time and long-term observation describe longitudinal approaches, which are not features of cross-sectional designs.