Psychology / Unit 12 Psych 1441 short lesson, about 20 seconds
Evaluating a Waitlist-Controlled Claim
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The idea
A therapy that outperforms a waitlist has been shown to beat no treatment, which does not establish that it beats an alternative.
In practice
A study reports large gains against a waitlist and never compares the treatment to an existing therapy.
Where people slip
Waitlist controls also carry expectancy effects in the opposite direction. Waiting is not a neutral condition.
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