Attrition
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.
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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?