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Strategies to Mitigate Attrition
To counteract the high expected dropout rates in longitudinal studies, researchers often employ specific strategies. A common approach is to recruit a larger initial sample of participants than is ultimately required, anticipating that a significant portion will leave over time. Additionally, throughout the study, researchers must continuously monitor their sample to ensure it remains representative of the broader population and make necessary adjustments if the group's composition changes due to attrition.
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Strategies to Mitigate Attrition
A researcher begins a 10-year study to track the long-term cognitive benefits of a new preschool curriculum, starting with 500 children from diverse socioeconomic backgrounds. By the end of the study, only 250 children remain. The data reveals that most of the children who left the study were from low-income families who had moved frequently. What is the most significant threat this situation poses to the researcher's conclusions?