Psychology / Psych 1441 · Atom · ~20 seconds
Evaluating a Waitlist-Controlled Claim
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A therapy that outperforms a waitlist has been shown to beat no treatment, which does not establish that it beats an alternative.
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A study reports large gains against a waitlist and never compares the treatment to an existing therapy.
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Waitlist controls also carry expectancy effects in the opposite direction. Waiting is not a neutral condition.