Definition:
In psychology experiments, selective attrition describes the tendency of some people to be more likely to drop out of a study than others. This tendency can threaten the validity of a psychological experiment.
It is important to note that selective attrition does not mean that certain people are more likely to quit a study. Instead, it simply implies that there is a tendency for people to quit an experiment for a variety of reasons. For example, people might be forced to drop out of a study because they are moving out of the area.
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