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نرخ فرسایش
However, depending on the field setting, the attrition rate may be higher than it is in other types of studies.
A lower attrition rate may be expected in a field-based study that is a repeated measures design.
However, the attrition rate may be higher in an observational field study in which subjects are performing an arduous task that has a high rate of failure
Attrition rate: natural or expected reduction in total subjects that are able to complete all research procedures (either due to illness, injury, fitness ability, etc.)
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