SNSF Ambizione Lecturer in Social Psychology @Centre_LIVES/@unil. Tweet once a week. Interests: #IncomeInequality #SocialClass #Motivation #OpenScience #Stats
Dec 15, 2022 โข 12 tweets โข 6 min read
At the top U.S. universities in psychology, there are 17 Democrats for every 1 Republican.
Some argue that this kind of political imbalance is not a cause for concern.
Others believe that it poses an existential threat to the field.
๐งต A dialectical thread ๐งต
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Two studies suggest that the political orientation of researchers or their studies has little effect on research outcomes.
Sep 12, 2022 โข 5 tweets โข 8 min read
@dom_muller@mjbsp@FGabarrot@cedricbatailler I get your point & that of @AntalHaans/@seriousstats. FYI, we intend to adjust the wording of the piece to be more precise & add a subsection on interaction ES. That being said, I don't think there are any mathematical flaws in the preprint or any confound in the sims. 1/5@dom_muller@mjbsp@FGabarrot@cedricbatailler@AntalHaans@seriousstats First, I agree that: 1) power calculation is the same for main effects & interactions (eq. 1) and 2) ES calculation is essentially the same for main effects & interactions (eqs. 2 & 3, respectively).
(note that the overall interaction ES is displayed by the web app) 2/5
๐ข Our new preprint features:
๐ญ An intuitive taxonomy of 12 types of interaction
...with the ๐s to reach power = .80/.90
๐ฎ A ๐ญ meta-study
๐ฏ Simulations testing 3 ways to โ๏ธ power
๐ฐ A cool web app!
๐งต
osf.io/xhe3u/
๐ญ๐ฎ As we know from popular blogs/papers, power analyses differ b/w main effects & interactions because:
๐a main effect corresponds to a difference b/w means
๐a two-way interaction corresponds to a difference b/w mean subdifferences
(using simple b/w-Ss designs as examples)
Sep 27, 2018 โข 5 tweets โข 2 min read
The Spirit Level has been cited โ10K times (โ700 times in 2018).
The book is straightforward: It uses cross-sectional data to show negative effects of #IncomeInequality on health.
The problem: It does NOT hold up to scrutiny.
๐ Thread ๐
#1 ๐-picking.
In the Spirit Level, some countries are excluded from the analysis without justification. When including these countries and using the latest estimates available, the core findings of the book disappear. [2/5]
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