Evidence-Based Practice / Unit 22 EBP 3164 short lesson, about 20 seconds
Attrition
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The idea
Attrition is participants dropping out, and it threatens a study because the groups that remain may no longer be equivalent to each other.
In practice
More participants lost from one group than the other, by the study's end.
Where people slip
Unit 06 taught reading attrition in the arithmetic — whether the n values still sum to N. This is what that arithmetic was detecting.
Your place on the trail
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