Psychology / Unit 8 Psych 0954 short lesson, about 20 seconds
Reading a Longitudinal Design with Attrition
Captions available
The idea
A longitudinal design with heavy attrition supports conclusions only about the participants who remained.
In practice
A sixty-year study ends with the healthiest quarter of its original sample still enrolled.
Where people slip
Attrition is rarely random. The survivors differ from the dropouts in ways that shape the result.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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