Answer:
attrition
Step-by-step explanation:
Attrition in research is said to be when individuals or participants abort or stop his/her involvement during a research study. It almost always happens to some extent. participants leaves a research study due to certain factors or circumstances usually beyond their control. when participant of a research leaves or remove his/herself from an experiment, it sometimes can make the study to be aborted, findings experience difficulties and slowing down of research study.