Laura Bronner on Twitter: "Ha, thanks! 😊… "

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Whitney R. Robinson Retweeted Arman Oganisian

I’m so excited! Past couple years, I’ve wanted to sit down & structurally* deconstuct Roland Fryer’s 2019 paper on racial difs in police use of force to use as a teaching example** re: #colliderbias. Alas life got in the way...1/ HT @l_farland *analyze “structure” in a #DAGhttps://twitter.com/StableMarkets/status/1276276257790066694 …

Whitney R. Robinson added,

Arman Oganisian @StableMarkets

Collider Bias getting some press. https://twitter.com/FiveThirtyEight/status/1276269951582601218 …

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

#ColliderBias^ is rampant in US disparities research that uses admin data like hospital claims, police records. Almost all non-random samples will differentially select by race & other imp factors ^a selection bias with a particular structure in #causalinference #DAGs 2/

1 reply 1 retweet 18 likes

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Side note: Dr. Chanelle Howe (@BrownUniversity) and I explore a different type of selection bias in this @EpidemiologyLWW paper https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5985150/ … Structural selection bias* is EVERYwhere in health disparities, research, y’all! 3/

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

*To understand the “structural” in structural selection bias, read this paper (@_MiguelHernan, S. Hernandez-Diez, J. Robins). Then read it again. Like every few months. 4/ https://scholar.google.com/scholar?hl=en&as_sdt=0%2C34&q=structural+selection+bias+Miguel+Hernan&btnG=#d=gs_qabs&u=%23p%3DK8GJcDXvmOwJ …

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Anyway, I kept meaning to read this paper but never got around to it. But now some #epitwitter-conversant poli sci folks seem to have done it! **even put fryer paper in syllabus in my social epi course in 2019 to make myself read it but it got pushed out by something else 5/

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

So far, I’ve just read the @FiveThirtyEight article by @laurabronner (see thread). I like it bc there are graphics. Selection bias is hard, y’all. It’s not intuitive. That’s why I love the structural approach. But graphics help a lot too! 6/

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Even many smart experienced #epitwitter don’t get structural selection bias and how it messes with interpretations of race/ethnicity and gender and immigrant and #LGBTQ coefficients in epidemiology. So im always looking for better ways to explain 7/

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Question for y’all: Do you find the graphical representation in the @laurabronner @FiveThirtyEight article helpful? Illuminating of some aspect of selection bias DAGs don’t communicate well? How do you teach these concepts? 8/

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Whitney R. Robinson‏ @WhitneyEpi Jun 26

Also I’ll @laurabronner article forever bc of footnote 2: “The term got its name because if you’re drawing a sloppy diagram of the directions in which you think causal effects go, the arrow heads pointing to one of the boxes in the diagram will collide. I wish I was kidding.”