Paper 1 · Research Aptitude
UGC NET December 2021 June 2022 (11.07.2022) Shift-I
When original participants in a longitudinal study drop out midway, it is called
AExperimental distancing
BRespondent deviation
CMortality ✓ Correct
DSample redundancy
Correct answer: (C) Mortality — The loss of original participants during a longitudinal study is called mortality or attrition, so option C is correct.
Explanation
★The loss of original participants during a longitudinal study is called mortality or attrition, so option C is correct.
★A longitudinal study follows the same subjects repeatedly over a long period.
★When subjects withdraw, relocate, or stop responding, the sample shrinks over time.
★This attrition threatens internal validity because dropouts may differ systematically from those who remain.
★Such selective loss can bias the findings if the remaining sample no longer represents the original group.
★The other terms are not standard methodological labels for participant loss.
★Researchers counter mortality by oversampling at the start and tracking participants carefully.
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