A student who is participating in a long term research project decides to stop participating and does not inform the experimenter of his decision. This is an example of which of the following threats to validity?

Question

Quizplus · Accepted Answer

Attrition refers to the loss of participants from a study over time, which can threaten the validity of the results if the reasons for participants dropping out are related to the study itself or if the dropout rate is uneven across groups. In this case, the student's decision to stop participating without informing the experimenter is a clear example of attrition.

A Student Who Is Participating in a Long Term Research