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Andrew Goodman-Bacon @agoodmanbacon
, 3 tweets, 1 min read Read on Twitter
And industry has been doing this for a century.
Here's a physician group, the California League for the Conservation of the Public Health (academic.oup.com/jhmas/article/…) writing in 1918:
Worth noting that in the health insurance context it doesn't become "socialized medicine" until after WWII. Before that it's "too German" not "too socialist".
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Does your diff-in-diff treatment variable turn on at different times? Of course! Most of them do!

nber.org/papers/w25018

Very happy to share my paper showing how DD with variation in treatment timing works and what that means in theory and practice. 1/29
So…

Maybe there are untreated units and units treated at different times.

Maybe you ONLY have variation in timing (ie. everyone winds up treated).

Essentially your data look like this: 2/29
We add “two-way fixed effects” for units and times to our regression. But what comparisons actually get made in this case? Where did the elegant DD expression in terms of sample means go? 3/29
Read 30 tweets
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OK, a thread of weird graphics from historical reports that I like.
Not (Medicare) sure (could) what ("cover") the (us) subtext (all) here (you know) could (like) be (a blanket?!).
Here is a waterfall of faces in need and some plaintive Old Age Assistance recipients from 1960.
Read 14 tweets
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I'm so excited to have ordered a bunch of Frederick Wiseman documentaries today (for work!).

The most immediately relevant one is "Welfare": 3 hours of unadorned footage from a NYC welfare office in 1975. It's not for everyone, but it is totally for me

cinetrafic.fr/video/extrait-…
"Hospital" (1970) gives the same treatment to Metropolitan Center Hospital in East Harlem:

"High School" to a high school in Philadelphia in 1968:
vimeo.com/176401029
Read 6 tweets

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I'm a sociologist who studies adolescent sexual violence. On this thread, I will be live tweeting the #Kavanaugh hearing, chiming in with sociological insights and research findings.
Full disclosure--I will probably step away for parts of it. While many conservatives have cast feminists as people who rejoice at allegations of sexual assault against powerful men, this is a painful process for us. We know survivors. We are survivors. And I will need breaks.
It does not bode well that the beginning of this hearing is starting with equating #Kavanaugh and #Ford's experiences with harassment following Dr. Ford's allegations. They are absolutely not the same.
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.#AugustaGA "euthanized" an alligator in Lake Olmstead wfxg.com/story/38792486… Many people were bothered by this story, including myself. Only after watching a @pbs @PBSNature episode on people & lions in #Gujarat #India was I able to articulate why this seemingly trivial
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Now up is @BrytheFlyGuy on how to translate the hard science behind systematics and taxonomy to the public through #scicomm #SpnhcTdwgNZ
(You might remember him from the time he named a golden-butted fly af Beyonce.)
He compares radio interviews to kale: you probably don’t like it/them the first time, but then you know it’s good for you and eventually come to like it/them.
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In this thread, I will go through the history of research that led to the concept of metabolic syndrome, as formulated by Gerald Reaven in 1988. 1/n
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Read 133 tweets
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Let's be clear Zoe. This is an hypothesis that has all available evidence against it.

USDA and FAO data both show fat going up since the dietary guidelines were released--and more than carbohydrates.

Thread. With graphs and data. 1/n
Here are USDA and FAO dietary trend data in the attached graphs.

As we can see, the "gap" between carbohydrates and fats narrows over time, indicating a faster rise of fats compared to carbohydrates. 2/n
Below is the above data, but with a breakdown for each nutrient class.

These observations suggests that the claim that reduced fat caused carbohydrates to go up is wrong. 3/n
Read 76 tweets
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Here's a thread for @Noahpinion on how economists have studied African development. We can divide this into i) long-run causes: (pre) colonial history, slavery, political institutions, ethnicity, and ii) proximate causes: mkt and govt failures. I'll focus on the first.
First, does pre-colonial history matter? Big time. The slave trade had long-lasting effects on development (Nunn 2008) dash.harvard.edu/bitstream/hand… . The likely mechanism was reduced trust among tribes. Nunn and Wantchekon (2011) aeaweb.org/articles?id=10….
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Read 24 tweets

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