Category: Education

52 things Tom Whitwell learned in 2018

Here is one of them:

35% of Rwanda’s national blood supply outside the capital city is now delivered by drone. [Techmoran]

Here is another:

Advertisers place a single brown pixel on a bright background in a mobile ad. It looks like dust, so users try to wipe it off. That registers as a click, and the user is taken to the homepage. [Lauren Johnson]


Those weirdly expensive books on Amazon could be part of a money laundering scheme. [Brian Krebs]


Expensive placebos work better than cheap placebos. [Derek Lowe]

And if you ever doubted it:

There is a small but thriving startup scene in Mogadishu, Somalia. [Abdi Latif Dahir]

Here is the whole list, definitely recommended.  Via Anecdotal.

If you love prediction markets you should love the art world

Think of art markets, and art collecting, as an ongoing debate over what is beautiful and also what is culturally important.  But unlike most debates, you have a very direct chance to “put your money where your mouth is,” namely by buying art (it is very difficult to sell art short, however).  In this regard, debates over artistic value may be among the most efficient debates in the world.  At least if you are persuaded by the basic virtues of prediction markets.  The prices of various art works really do aggregate information about their perceived values.

I have, however, noted a correlation, how necessary or contingent I am not sure.  The “white male nerd types” who are enamored of prediction markets tend to be especially skeptical of the market judgments of particular art works, most of all for conceptual and contemporary art.

In my view, discussions about the value of art, as they occur in the off-the-record, proprietary sphere, are indeed of high value and they deserve to be studied more closely.  Imagine a bunch of people competing to make “objects that are interesting but not interesting for reasons related to their practical value.”  And then we debate who has succeeded, or not.  And those debates reflect many broader social, political, and economic issues.  And it is all done with very real money on the line.  The money concerns not just the value of individual art works, but also the prestige and social capital value that arises from having assembled a prestigious and insightful collection.

Meet the Pioneers

Here are the winners from the first Pioneers tournament, summarized here:

In the short 3 months since its launch, Pioneer has garnered a global reach. Our first tournament featured applicants from 100 countries, ranging from 12 to 87 years old. Almost half of our players hailed from countries like India, UK, Canada, Nigeria, Germany, South Africa, Singapore, France, Turkey, and Kenya. Projects were spread across almost every industry — AI research, physics, chemistry, cryptocurrency and more.

They are a remarkably impressive group, here is one example:

Clark Urzo (23, Philippines)

Clark is making a programming language for physics. The idea is to enable anyone who can code to contribute to serious physics research (for example, simulations of gravitating systems). This opens up the field to the wondrous forces of open source and promotes open and accountable science along the way.

Noteworthy: Clark has an insanely impressive trajectory. He learned to code when he was 12. By 16, he was doing Laplace transforms, tinkering with Arduinos, reading Marx and Nietzsche, and taught himself conversational German. He co-founded a VR company by 19.


Harshu Musunuri (18, USA)

Harshu is creating synthetic materials to improve the diagnosis, treatment, and prevention of sepsis, a leading cause of death in hospitals around the world. Unlike other approaches, these materials don’t require refrigeration and enable low-cost toxin capture in resource-poor settings.

Noteworthy: Harshu comes from a humble background: she was born to an electrical engineer and an elementary school math teacher in a small village in South India. But her work is anything but humble. In her short career, she’s done research with NASA’s JPL, built a seizure detection app for epileptic patients and is now working on a project with the potential to save thousands of lives. She’s also a hacker at heart: when she lacked the formal lab tools to braze at high temperature, she used the exhaust vent of a ceramic kiln.

The overall lesson is that there is a great deal of undiscovered talent out there, and also that some people are out there discovering it!  And if you wish to apply to round two, just follow the instructions at the top link.

Insurance markets in everything

The University of Illinois at Urbana-Champaign has paid $424,000 to insure itself against a significant drop in tuition revenue from Chinese students.

In what is thought to be a world first, the colleges of business and engineering at the university signed a three-year contract with an insurance broker to pay the annual six-figure sum, which provides coverage of up to $60 million.

The university came up with the idea in 2015 and implemented it last year but received permission from the broker to discuss it in public only earlier this month.

Here is the story.

Fading Legacies: Human Capital in the Aftermath of the Partitions of Poland

This paper studies the longevity of historical legacies in human capital. The Partitions of Poland (1772-1918) represent a natural experiment that instilled Poland with three different legacies of education, resulting in sharp differences in human capital among the Polish population. I construct a large, unique dataset that reflects the state of schooling and human capital in the partition territories from 1911 to 1961. Using a spatial regression discontinuity design, I find that primary school enrollment differs by as much as 80 percentage points between the partitions before WWI. However, this legacy disappears within the following two decades of Polish independence, as all former partitions achieve universal enrollment. Differences in educational infrastructure and gender access to schooling simultaneously disappear after WWI. The level of literacy converges likewise across the former partitions, driven by a high intergenerational mobility in education. After WWII, the former partitions are not distinguishable from each other anymore.

That is from Andreas Backhaus, a job market candidate from University of Munich.

Open questions from Gwern

This is all Gwern, I won’t add another layer of indentation:

Open Questions

Some questions which are not necessarily important, but do puzzle me or where I find standard answers to be unsatisfying (along the lines of Patrick Collison’s list & Alex Guzey; see also my list of project ideas):

  • What is personal productivity and why does it vary from day to day so strikingly, and yet not correlate with environmental variables like weather or sleep quality nor appear as the usual kind of latent variable in my factor analyses? Is it something much weirder than the usual kind of latent variable, like a set of zero-sum measurements drawing on a generic pool of energy or mana?
  • Does listening to music while working serve as a distraction, or motivation?
  • What, algorithmicly, are mathematicians doing when they do math which explains how their proofs can usually be wrong but their results usually right?Is it equivalent to a kind of tree search like MCTS or something else? They wouldn’t seem to be doing a literal tree search because then there would almost never be mistakes in the proof (as the built-up tree of theorems only explores valid inferential steps), but if they’re not, then how are they handling logical uncertainty? Are they doing something like MCTS’s random playouts where lemmas are not proven but simply heuristically given a truth value to shortcut exploration and the heuristic is accurate enough to usually guess correctly and this is why the proofs are wrong but the results are right?
  • Why did Jean Calment live so many more years than other centenarians, breaking all records and setting a life expectancy record which decades later has not just not been broken, but not even approached? Which is extraordinary considering that she smoked, medicine has continuously advanced, the global population has increased, life expectancy in general has increased, and the Gompertz curve implies that, with mortality rates approaching 50%, centenarians should die like flies and ever closer in age to each other and not have occasional enormous permanent 3 year gaps between the record setter (Calment) and everyone since then.
  • Why do humans, pets, and even lab animals of many species kept in controlled lab conditions on standardized diets appear to be increasingly obese over the 20th century? What could possibly explain all of them simultaneously becoming obese?
  • What happened to the famous genome sequencing cost curve after late 2012, which stopped price decreases, damaged genetics, and delayed the advent of whole-genome sequencing by perhaps a decade? Was it really just the Illuminati’s fault?
  • Why do humans have such a large mutation load on common genetic variants? Common SNPs make up a large fraction of variance, even for traits which must be fitness-affecting. Culture or technology slow evolution doesn’t wash when human fitness differentials are so large and so many people died young or as infants, and how did the many deleterious variants get pushed up to such high frequencies in the first place?
  • Why does the immune system so often surface as a genetic correlation or tissue enrichment in GWASes for many things not generally believed to be infectious? Are we missing an enormous range of infections directly causing bad things (or indirectly through autoimmune mechanisms), or the immune system just sort of like intelligence in being a general health trait?
  • Why does catnip response vary so much across countries in domestic cats, and also across feline species, with no apparent phylogenetic or environmental pattern? It is so heritable in domestic cats that a genetic reason is plausible, but if it’s adaptive, what is it doing when catnip doesn’t exist in the ranges of most tested cats, and if it’s neutral why can so many closely-different different animals respond to it in different ways?

TC again: There is much more at the link.  If you don’t know Gwern, you should know Gwern.

Why do so many academics dislike the market?

It seems Nozick was right after all, here is Raul Magni-Berton and Diego Rios:

In this article, the authors explore why academics tend to oppose the market. To this intent the article uses normative political theory as an explanatory mechanism, starting with a conjecture originally suggested by Robert Nozick. Academics are over-represented amongst the best students of their cohort. School achievement engenders high expectations about future economic prospects. Yet markets are only contingently sensitive to school achievement. This misalignment between schools and markets is perceived by academics – and arguably by intellectuals in general – as morally unacceptable. To test this explanation, the article uses an online questionnaire with close to 1500 French academic respondents. The data resulting from this investigation lend support to Nozick’s hypothesis.

Via Rolf Degen.

The best results on assortative mating and inequality I have seen

This paper studies the evolution of assortative mating in the permanent wage (the individual-specific component of wage) in the U.S., its role in the increase in family wage inequality, and the factors behind this evolution. I first document a substantial trend in assortative mating, as measured by the permanent wage correlation of couples, from 0.3 for families formed in the late 1960s to 0.52 for families formed in the late 1980s. I show that this trend accounts for more than one-third of the increase in family wage inequality across these cohorts of families. I then argue that the increase in marriage age across these cohorts contributed to the assortative mating and thus to the rising inequality. Individuals face a large degree of uncertainty about their permanent wages early in their careers. If they marry early, as most individuals in the late 1960s did, this uncertainty leads to weak marital sorting along permanent wage. But when marriage is delayed, as in the late 1980s, the sorting becomes stronger due to the quick resolution of this uncertainty with work experience. After providing reduced-form evidence on the impact of marriage age, I build and estimate a marriage model with wage uncertainty and show that the increase in marriage age can explain almost 80% of the increase in assortative mating.

That is from the job market paper of Alparslan Tuncay, from the University of Chicago.

My Conversation with John Nye

John is one of the smartest people I know, and one of my favorite people to talk to, here is the transcript and audio.  Here is the opening summary:

Raised in the Philippines and taught to be a well-rounded Catholic gentleman, John Nye learned the importance of a rigorous education from a young age. Indeed, according to Tyler he may very well be the best educated among his colleagues, having studying physics and literature as an undergraduate before earning a master’s and PhD in economics. And his education continues, as he’s now hard at work mastering his fourth language.

On this episode of Conversations with Tyler, Nye explains why it took longer for the French to urbanize than the British, the origins of the myth of free-trade Britain, why Vertigo is one of the greatest movies of all time, why John Stuart Mill is overrated, raising kids in a bilingual household, and much more.

Here is one bit:

NYE: In fact, one of the things I do know about the 19th century is that there’s no evidence that either unilateral free trade or multilateral did very much.

Almost all the free trade in Europe in the 19th century was a product of, initially, the bilateral trade agreement between Britain and France, sometimes known as the Anglo-French Treaty of Commerce of 1860, in which they each agreed to much more liberalized trade on a most-favored-nation basis. Once they accepted this, then what happened is, anyone who signed on to either Britain or France on the most-favored-nation basis then bought into, in some sense, this system.

Here is another:

COWEN: Particular mistakes aside, what were the systemic mistakes the Western world was making in, say, 1910, 1912?

NYE: I think the systemic mistake really boils down to how do you deal with the problem of power? How do you deal with the problem of different groups, different cultures wanting their place at the table? It’s clear that, if you look, a lot of the fight of imperialism was great-power competition.

If you look in the Far East, for example, some people may know that the United States took the Philippines from Spain at the end of the period of Spanish control of the Philippines in 1898, and partly this was due to Perry’s decision to sail into Manila Bay.

One of the things that’s not discussed — most people are unaware of — is that the German and British fleets were waiting in Hong Kong. They were waiting to see what the Americans did. And it’s quite likely that, had the Americans not steamed into Manila Bay, that the Germans or British would have intervened in the Philippines once the Spanish collapsed.


COWEN: And if there’s an underlying political subtext or import of Hitchcock, what do you think that would be? Not what he necessarily intended as his politics, but what’s in the movies in terms of human nature and political man?

NYE: Well, I think there’s this question of suspicion and the tendency to not appreciate how much is going on under the surface. I think people tend to see these things narrowly in terms of Cold War paranoia. But Hitchcock was a political conservative, and he was much more of the very old British conservative view that one should be wary in times of —

COWEN: Suspicion is metaphysical, right?

Definitely recommended, I am very honored to have had the chance to do this with John.

The long-run impacts of same-race teachers

From Seth Gershenson, Cassandra M.D. Hart, Joshua Hyman, Constance Lindsay and Nicholas W. Papageorge:

We examine the impact of having a same-race teacher on students’ long-run educational attainment. Leveraging random student-teacher pairings in the Tennessee STAR class-size experiment, we find that black students randomly assigned to a black teacher in grades K-3 are 5 percentage points (7%) more likely to graduate from high school and 4 percentage points (13%) more likely to enroll in college than their peers in the same school who are not assigned a black teacher. We document similar patterns using quasi-experimental methods and statewide administrative data from North Carolina. To examine possible mechanisms, we provide a theoretical model that formalizes the notion of “role model effects” as distinct from teacher effectiveness. We envision role model effects as information provision: black teachers provide a crucial signal that leads black students to update their beliefs about the returns to effort and what educational outcomes are possible. Using testable implications generated by the theory, we provide suggestive evidence that role model effects help to explain why black teachers increase the educational attainment of black students.

I would describe the strength of this effect as one of the main and most important things economists have taught us over the last five years.

*Where Economics Went Wrong: Chicago’s Abandonment of Classical Liberalism*

That is the new book by David Colander and Craig Freedman, here is one short bit:

The best way of conveying our conception of what is at least suggestive of a Classical Liberal stance is to present a handful of economists who, in our view, reflect this attitude.  We have chosen six economists: Edward Leamer, Ariel Rubinstein, Alvin Roth, Paul Romer, Amartya Sen, and Dani Rodrik.  Each have, in our view, displayed a Classical Liberal attitude to methodology in important aspects of their work.

I am very much in favor of what the authors propose here, although I might reserve the term classical liberal for the more traditional political distinction.

*Aquinas and the Market: Toward a Humane Economy*

By Mary L. Hirschfeld, here is the opening passage from the Preface:

My rather peculiar intellectual journey began with my pursuit of a Ph.D. in economics at Harvard University, granted in 1989, and culminated in a second Ph.D. in theology, from the University of Notre Dame in 2013.  Economics and theology are two very different sets of discourses, and this book is the result of my effort to sort out the resulting cacophony in my own head.  When I began my career, I would never have imagined writing such a book.  For starters, I was an ordinary somewhat spiritually inclined but definitely not religious type when I began my academic career at Harvard in the fall of 1983.

Definitely recommended, and not just for Ross Douthat.  It is exquisitely written as well.  I enjoyed this sentence in the acknowledgements:

It is because of Tyler that I am a convinced Thomist, though that outcome would undoubtedly horrify him.

I am not easily horrified these days!  Thus there are doubts, always doubts.

Buy the book here.

All Hail Dalton Conley

Conley describes his early academic work as “lefty sociology.” His Ph.D. thesis was on the black-white wealth gap and he dedicated his early career to studying the transmission of health and wealth between parents and children.

At N.Y.U., Conley kept getting into disagreements with geneticists, arguing that their methods were dangerously naïve. It seemed to him implausible that studying only twins — the gold standard of genetics research — was enough to teach us the difference between nature and nurture. But over time, he decided that it wasn’t enough to just argue. Conley is an academic, and even within that tortured group he is something of a masochist. At that time he was a tenured professor, the kind of gig most people see as the endgame of an academic career, and yet he decided to go back and grind out another Ph.D., this time in genetics. He went into his program believing that our social environment is largely the cause of our outcomes, and that biology is usually the dependent variable. By the end of his time, he says, the causal arrow in his mind had pretty much flipped the other way: “I tried to show for a range of outcomes that the genetic models were overstating the impact of genetics because of their crazy assumptions.” He sighs. “But I ended up showing that they’re right.”

From the New York Times piece on Geno-Economics (Tyler linked to it yesterday also).

Teacher expectations matter

From Nicholas W. Papageorge, Seth Gershenson, and Kyung Min Kang:

We develop and estimate a joint model of the education and teacher-expectation production functions that identifies both the distribution of biases in teacher expectations and the impact of those biases on student outcomes via self-fulfilling prophecies. Our approach leverages a unique feature of a nationally representative dataset: two teachers provided their educational expectations for each student. Identification of causal effects exploits teacher disagreements about the same student, an idea we formalize using lessons from the measurement error literature. We provide novel, arguably causal evidence that teacher expectations affect students’ educational attainment: Estimates suggest an elasticity of college completion with respect to teachers’ expectations of about 0.12. On average, teachers are overly optimistic about students’ ability to complete a four-year college degree. However, the degree of over-optimism of white teachers is significantly larger for white students than for black students. This highlights a nuance that is frequently overlooked in discussions of biased beliefs: less biased (i.e., more accurate) beliefs can be counterproductive if there are positive returns to optimism or if there are socio-demographic gaps in the degree of teachers’ optimism; we find evidence of both.

This is the most important thing I will have to tell you today.  Here is commentary from Vera.