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Despite its strengths, longitudinal research has significant limitations, primarily related to its resource-intensive nature. A major drawback is the immense time commitment required from both researchers and participants, as these studies can span years or even decades. This long duration means that findings are not available for a considerable period. Furthermore, longitudinal studies demand a substantial financial investment, and many researchers may lack the necessary resources to carry a project through to completion. Another key challenge is participant attrition, where individuals drop out over time, potentially biasing the results.

Limitations of Longitudinal Research

Attrition refers to the loss of participants during a study. This is a particularly significant issue in longitudinal research, where dropout rates are often high and tend to increase as the study progresses over time. Participants may leave a study for numerous reasons, including major life events like moving, marriage, illness, or death, or they may simply decide to stop participating. This reduction in participants can threaten a study's validity, introduce bias, and weaken the power of its statistical conclusions.

Attrition

A research team plans to conduct a 20-year study to track how early reading habits in children affect their academic performance in college. The team will survey the same group of individuals every four years, starting at age 5. Which of the following describes the most significant practical challenge inherent to this research design?

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