Human Growth and Development / Unit 1 HGD 0060 short lesson, about 20 seconds
Longitudinal Designs
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The idea
A longitudinal design follows the same people over time, reassessing them to see how each one changes with age.
In practice
Fifty sixth-graders reassessed every year for five or six years.
Where people slip
It is slow and suffers attrition as people drop out, practice effects from repeated testing, and, most seriously, cohort effects.
Your place on the trail
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