Gelman and Loken nail it (for me)…. p-hacking and fishing need to be taken more seriously in Economics

I loved reading this article.

The garden of forking paths: Why multiple comparisons can be a problem, even when there is no “fishing expedition” or “p-hacking” and the research hypothesis was posited ahead of time

Andrew Gelman and Eric Loken

Abstract: Researcher degrees of freedom can lead to a multiple comparisons problem, even in settings where researchers perform only a single analysis on their data. The problem is there can be a large number of potential comparisons when the details of data analysis are highly contingent on data, without the researcher having to perform any conscious procedure of shing or examining multiple p-values. We discuss in the context of several examples of published papers where data-analysis decisions were theoretically-motivated based on previous literature, but where the details of data selection and analysis were not pre-specifed and, as a result, were contingent on data

It isn’t the final word, but it is amazing this conversation, started by Ed Leamer more than 30 years ago, is still going on.

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Reading fiction and changes in preferences or attitudes

Over email I was having an exchange with someone… thought I would put down some of my thoughts here.

I don’t really think it is very much established that reading fiction affects beliefs, at least in the social science sense of “affects”… in the philosophical sense, everything affects everything, so that is trite… in the common-sense sense, introspection clearly suggests that when immersed in fiction and in the warm glow shortly after, there is an effect. But in the social science sense, that reading fiction affects the reader any more than any other social experience (watching TV, engaging in conversation, going on a walk) where these are randomly assigned, well…. not sure. The correct framing of the question, to me, is whether random assignment (of this activity, for some significant period of time or changing the opportunity cost in some significant way) generates differences in outcomes (at time frames bigger than 15 min, which is what psych seems to focus on, just because to get published you have to have significant findings…;-) large enough to lead one to think “wow this is probably bigger than going for a walk”… well… to be honest… I’m skeptical… even though as you see from my website I am a huge reader and promoter of reading (I run a non-profit that supports community libraries in Africa). I think a lot of reading fiction is self-selection and so endogenous to beliefs….

Continuing…

There are lots of psych studies like this Harry Potter one… they have several problems:
a) they usually report effects “shortly” after treatment (does anyone doubt that very recently reading an account of the Holocaust, or making that reading salient, would change how you responded to questions in a survey?)
b) they often condition on “the reading affected you” (so then really just self-section-salience effect)…. if we give you $1000, and you are very smart and clever and care about getting rich, then giving you $1000 is a good way to raise people’s income
c) psych is notorious for selecting positive p-val studies for dissemination…. (the lure of media promotion must be irresistible)

My point (I think!) is that we do not need evidence that “reading a book can affect a person” because that is similar to saying “experiences can affect people” … so the real issue is the magnitude and the counterfactual…. and I think the magnitude of the short-term effect is pretty meaningless…. because any experience changes you in a short term so there are millions of counterfactuals (instead of reading the book you were asked to take a nap, or to meditate…)… so I guess my inclination is to only take seriously experiments that offer “prolonged exposure” and that measure outcomes “at a remove” from the exposure.  To my knowledge, in terms of reading fiction, I do not think anyone has ever done such an experiment.

An ideal experiment, then?  500 young adult are randomly given Autobiography of Malcolm X (contains a strong message of self-autonomy and self-identity construction, perhaps!) and a control group not given it.  10 years later, a previously defined (and registered) outcome measure is collected…. and verification that in meantime no special salience to the book (which could generate an interaction effect).

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Nice paper on effects of massive education philanthropy on education outcomes…

My only snarky comment: Good thing Jeanes and Rosenwald didn’t decide that the better  intervention was to use “technology” to improve education…. I can hear them… “the manual typewriter is the key to participation in today’s knowledge economy. We’ll provide two typewriters to every classroom with black students in the South.”

The Next Needed Thing: The impact of the Jeanes Fund on Black schooling in the South, 1900-1930

Daniel Kreisman

Abstract: The Jeanes Fund trained and supported Black teachers in over 600 Southern counties between 1909 and 1930, reaching over 40% of Black students by 1930. No evaluation of the program yet exists. Combining novel county-level data created from the Jeanes Fund’s archived records, I estimate the Fund’s impact on racial gaps in enrollment and literacy. I then compare these effects with those from the Rosenwald Fund, which built 5,000 schools for Black students over the same time period, allowing me to compare returns on investments in human resources Jeanes teachers with investments in physical capital Rosenwald schools, and to estimate the combined impact of both programs. I estimate that the Jeanes Fund contributed to approximately 16% of the decline in the Black-White gap in enrollment and 8.5% of the decline in the literacy gap during this time, and that taken together full exposure to both programs between ages 7 and 14 would have closed9 and 13 percentage point gaps in enrollment and literacy respectively, roughly equivalent to initial Black-White gaps conditional on family background.

via Kreisman_Jeanes.pdf.

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Twelve minutes of Werrason….

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Resisting a semi-authoritarian regime…

Newspaperman Newton Ahmed Barry gets his home and office broken into… My full sympathies, but may I also suggest “the cloud”? Google Drive, Dropbox…. good ways to store documents beyond the reach of thugs.

Ils ont coupé une fenêtre pour entrer. Mon bureau a été bien visité, le mien et celui de Germain Le Directeur de Publication, NDLR. Chez moi ils ont emporté tout ce qui est matériel ordinateur et clé usb. La chance que j’ai évidemment c’est d’avoir sauvé un certain nombre de choses sur des disques durs externes avec lesquels je me balade.Cela fait longtemps que je suis personnellement harcelé. Vous pouvez demander à Wemtenga Le commissariat de police de Wemtenga, NDLR, cela fait la quatrième fois maintenant que personnellement je suis visité par des cambrioleurs. A la maison d’abord, et puis pour la première fois au bureau. Au regard de ce que les gens recherchent chaque fois, moi j’ai l’impression que ce sont les services de l’Etat. Je les accuse ouvertement, c’est les services de l’Etat qui sont à nos trousses. Je ne sais pas pour quelle raison, mais en tout cas pour nous c’est eux. Maintenant, nous nous avons un certain nombre d’informations qu’on peut recouper mais on attend.

via Cambriolage du siège du Journal L’Evénement : « J’accuse ouvertement les services de l’Etat », Newton Ahmed Barry. – leFaso.net, l’actualité au Burkina Faso.

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Excellent commentary by Bill Sundstrom on economics publishing

The authors conclude that the top PhD programs are serving their students ill, and I won’t necessarily argue with that. Academia is changing, and the path to tenure at a decent university seems more fraught with hard work and long odds than ever. But their analysis needs a heavy dose of realism–in particular, specification of what economists would call an objective function. If your goal is to be a tenured professor at a decent college or university, what would it take to succeed? And how likely is success if you can get yourself through a top 10 or 20 program? I don’t think Conley and Önder have really answered these questions.

via Bill Sundstrom’s Blog: Surprisingly high non-success?.

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Teaching macro: The money quote in Mishkin and Herbertsson paper on Iceland

OK as I am reading the paper, here is an important sentence (“Goes to intent, your honor”):

The result has been a movement toward Iceland’s becoming an international banking center (although on a small scale because the country is, after all, a microstate), where its banks perform financial intermediation, mostly outside of the country… the
Icelandic banking system has changed from a system of local depositary institutions to an international financial intermediator in only five years.

Switzerland, Hong Kong, London, New York.  Mishkin and Herbertsson should have been asking themselves: Does a huge new money center pop up in 5 years because it has comparative advantage, or because there is lax financial regulation and consequently much leverage?  If you wanted to argue the former, some evidence of rapid successful expansion of money market without an underlying fundamental change in financial flows (i.e. no resource rents) would be in order. They provide none.

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In which I enter the coconut drink craze fray…

I think the craze is over even as news reports blow it way up, because if I am buying it because it is on sale for 99c at Grocery Outlet (pallets full of the stuff) and I am not liking it (well I might buy it again at 50c) then it isn’t going to be so big. What I don’t understand is that the original Brazilian version supposedly is sweet/salty (like a margarita?) so why do the versions on sale here taste so bad?

Next up baobab craze?

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Teaching macro: Mishkin and Iceland and “Inside Job”

“Inside Job” filmmaker Charles Ferguson replied to Mishkin:

First, Prof Mishkin alleges that I focused exclusively on his report on Iceland. But in an interview in September 2009 lasting more than an hour, and for which I can supply both video and transcript, I asked Prof Mishkin about his general views of the financial crisis and its causes, his 2006 report Financial Stability In Iceland, his activities as a governor of the Federal Reserve Board, his post-crisis views on issues ranging from financial reform to the growing inequality of income and wealth in the US and his consulting activities since returning to Columbia University.Prof Mishkin suggests that his 2006 report on Iceland identified various systemic risks, that the majority of bad behaviour in Iceland’s financial system occurred afterwards, and that Iceland’s real risks were unknowable. At the time he wrote his report, Iceland’s banking system had already borrowed $50bn, more than four times Iceland’s gross domestic product, in the preceding five years Iceland’s Financial Supervisory Authority had a total of 40 employees, including clerical staff, to monitor all of the country’s financial companies and markets, including banking, investing, and insurance and during the bubble about a third of these regulators departed to work for the banks. Prof Mishkin’s report does not mention this.Moreover, Prof Mishkin writes in his article: “The filmmaker made insinuations that I didn’t disclose that I was compensated for the study – even though he learned the precise amount of the fee in 2006 from a public disclosure that I made.”However, Prof Mishkin did not disclose in the report that he was paid to write it. Indeed, one of the most disturbing things I learned in making Inside Job, an issue discussed in the film, is that US universities do not require disclosure of financial conflicts of interest by faculty members, place no limits on the sources and size of professors’ outside income, and do not collect information on the size of this income. The only reason we now know of Prof Mishkin’s payment for the Iceland report is that he was later forced to disclose it when he was appointed to the US Federal Reserve Board.

via The director of ‘Inside Job’ replies | Economists’ Forum.

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Teaching macro: Preludes to the Icelandic Financial Crisis

Preludes to the Icelandic Financial Crisis

Iceland became one of the symbols of the fourth wave of the financial crisis, since the end of the first decade of the twenty-first century. Between 2003 and 2008, the market value of the stock of Iceland’s biggest companies increased by 700 per cent, and the assets of its three banks multiplied eightfold to eight times the country’s GDP. When the bubble burst, it helped bring the world economy to its knees.This volume brings together several papers written by professional economists before the crash, warning of the dangers of the bubble economy that was being created. The papers discuss the imbalances created by an inflow of foreign capital, the hazards of a rapidly expanding banking system, and the perils that all banks face in a bubble economy. The chapters also provide a case study of the economics profession before the collapse of the international financial system. What did and didn’t they see coming, and why? An introduction and conclusion contextualize the articles and draw out some important lessons.This book is essential reading for all interested in macroeconomics, economic policy and international finance, as well as anyone seeking to grasp the causes of the deepest global recession since the Great Depression.

via Preludes to the Icelandic Financial Crisis – Robert Z. Aliber – Palgrave Macmillan.

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Teaching macro: U.S. Economy Grew at 4% Rate in Second Quarter

The United States economy rebounded heartily in the spring after a dismal winter, the Commerce Department reported on Wednesday, growing at an annual rate of 4 percent from April through June and surpassing economists’ expecations.In its initial estimate for the second quarter, the government cited a major advance in inventories for private businesses, higher government spending at the state and local level and personal consumption spending as chief contributors to growth. Economists, who had been hoping for a full reversal of the first quarter’s decline, were cheered by the second quarter’s numbers. The consensus forecast for G.D.P. was 3 percent.

via U.S. Economy Grew at 4% Rate in Second Quarter, Beating Expectations – NYTimes.com.

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The question many non-econometricians ask themselves, that econometricians hitherto have always obfuscated, now answered….Finite population causal standard errors

When a researcher estimates the parameters of a regression function using information on all 50 states in the United States, or information on all visits to a website, what is the interpretation of the standard errors? Researchers typically report standard errors that are designed to capture sampling variation, based on viewing the data as a random sample drawn from a large population of interest, even in applications where it is difficult to articulate what that population of interest is and how it differs from the sample. In this paper we explore alternative interpretations for the uncertainty associated with regression estimates. As a leading example we focus on the case where some parameters of the regression function are intended to capture causal effects. We derive standard errors for causal effects using a generalization of randomization inference. Intuitively, these standard errors capture the fact that even if we observe outcomes for all units in the population of interest, there are for each unit missing potential outcomes for the treatment levels the unit was not exposed to. We show that our randomization-based standard errors in general are smaller than the conventional robust standard errors, and provide conditions under which they agree with them. More generally, correct statistical inference requires precise characterizations of the population of interest, the parameters that we aim to estimate within such population, and the sampling process. Estimation of causal parameters is one example where appropriate inferential methods may differ from conventional practice, but there are others.

via Finite Population Causal Standard Errors.

HT: Bill Sundstrom

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Teaching macroeconomics: Really bad article from vox.com

After starting with a ridiculous teaser headline (basically, “Janet Yellen doesn’t want you to get a raise”) the article doesn’t get even to an intermediate macroeconomics textbook level.

But wage growth contributes to inflation (your pay boost is your customers’ higher prices), and the Fed has to rein in inflation that’s too high before it wreaks havoc on the US economy. [“wreaks havoc” indeed… the reason the author cannot mention any actual havoc that could be wreaked from, dare we even mention an unspeakable, shudder, inflation rate of 5.2% is that… there isn’t any…]

It’s that recent spike [OMG, to 1.8% annual rate!] that the Fed has to contend with. Inflation for the most part doesn’t look like a serious threat right now — most FOMC members at their June meeting said they expected price growth to remain at or below 2 percent through 2016 [so why are we writing and reading this article?] , and LeBas agrees that there’s no reason to worry right now. But should something like a spike in wages help send inflation even higher, the central bank will want to tighten policy to keep the economy from overheating, for example by raising interest rates… Once wage growth catches on among lots more workers, it could help send inflation over that 2-percent mark. And while too little inflation can tank the economy, so can too much, as people’s money diminishes in value. [Oh really? But wait, weren’t wages rising? So incomes are not actually diminishing in value…?]

At the end of the day, the article reinforces the “money illusion” that is probably exactly the job of an outfit like vox.com to dispel!  Talk about irony.  via Janet Yellen doesn’t want you to get too big a raise – Vox.

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Teaching Macroeconomics: Iceland’s crash of 2008

My MBA class is using Mishkin’s macro textbook, and we are exploring his notoriety as author of an analysis of Iceland’s macroeconomy circa 2006.

The quote of the day, from Thorvaldur Gylfason:

In 2012, senior Central Bank officials testified in the Court of Impeachment hearing of the criminal case brought by Parliament against Iceland’s pre-crash Prime Minister, Geir Haarde, that the writing was on the wall already in 2006. On the stand, one senior Central Bank official likened the operations of the Icelandic banks before the crash to the Ponzi scheme operated by Bernard Madoff in the US. Even so, the Central Bank continued to lend money to the banks without adequate collateral, bankrupting itself in the process. The fiscal cost of recapitalizing the three commercial banks amounted to another 18% of GDP.

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Great article by Liberian journalist Rodeny Sieh on Ebola etc.

In setting up her task force to deal with the Ebola threat, President Sirleaf says: “We must come together as never before despite of our political, religious and social persuasions, we must show a deep sense of nationalism. We must reach across borders and join our brothers and sisters in other neighboring countries that are affected to ensure continuing common response.” Upon the declaration of Ebola as a National Emergency, the task force headed by President Sirleaf, has announced the closure of all border entry points.”I hope that this time, the president means it, I hope this time eye-servant Cabinet ministers and government officials, notorious for waiting for the President to move before they move will take this Ebola madness more serious than they have. While the setting up of a task force and late measures to curb Ebola is commendable, the president must take steps and action to dismiss someone over the poor handling of this, particularly, whoever was responsible for not quarantining Patrick Sawyer and whoever allowed him to leave Liberia.

via FrontPageAfrica – Letter From Lagos: Wish Liberia Had Done This Much to Curb Ebola.

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Interesting interview with Salif Diallo now in MPP

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Antidote to “A Separation”

Over the weekend I watched the Iranian movie A Separation. I was talking with an Iranian colleague about how much despair there is in the movie… a man and his daughter deal with the consequences of the wife separating, as they care for the husband’s aging father who has Alzheimer’s.  Very complex, nuanced movie.  If you like Kieslowski, you will definitely like A Separation.

Anyway, my colleague suggested something a little more inspiring of hope and joy.  So here it is. Wonderful music and singing. Thanks MG!

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Teaching macroeconomics: Why has the ECB introduced a negative interest rate?

Pretty gosh darn clear explanation.  Get that money working.  If you earn nothing (or negative return) then you are more likely to lend the funds to someone who is actually going to do something (start a restaurant, expand a cleaning business, build a new app).

Why has the ECB introduced a negative interest rate? The European Central Bank’s mandate is to ensure price stability by aiming for an inflation rate of below but close to 2% over the medium term. Like most central banks, the ECB influences inflation by setting interest rates. If the central bank wants to act against too high inflation, it generally increases interest rates, making it more expensive to borrow and more attractive to save. By contrast, if it wants to counter too low inflation, it reduces interest rates.Since euro area inflation is expected to remain considerably below 2% for a prolonged period, the ECB’s Governing Council has judged that it needs to lower interest rates. The ECB has three main interest rates on which it can act: the marginal lending facility for overnight lending to banks, the main refinancing operations and the deposit facility. The main refinancing rate is the rate at which banks can regularly borrow from the ECB while the deposit rate is the rate banks receive for funds parked at the central bank. All three rates have been lowered.To maintain a functioning money market in which commercial banks lend to each other, these rates cannot be too close to each other. Since the deposit rate was already at 0% and the refinancing rate at 0.25%, a cut in the refinancing rate to 0.15 % meant the deposit rate was lowered to − 0.10 % to maintain this corridor.The cut is part of a combination of measures designed to ensure price stability over the medium term, which is a necessary condition for sustainable growth in the euro area.Do I now have to pay my bank to keep my savings for me? What is the effect of this negative deposit rate on my savings? There will be no direct impact on your savings. Only banks that deposit money in certain accounts at the ECB have to pay. Commercial banks may of course choose to lower interest rates for savers. At the same time, though, consumers and businesses can borrow more cheaply and this helps stimulate economic recovery.In a market economy, the return on savings is determined by supply and demand. For example, low long-term interest rates are the result of low growth and an insufficient return on capital. The ECB’s interest rate decisions will in fact benefit savers in the end because they support growth and thus create a climate in which interest rates can gradually return to higher levels.But why punish savers and reward borrowers?A central bank’s core business is making it more or less attractive for households and businesses to save or borrow, but this is not done in the spirit of punishment or reward. By reducing interest rates and thus making it less attractive for people to save and more attractive to borrow, the central bank encourages people to spend money or invest. If, on the other hand, a central bank increases interest rates, the incentive shifts towards more saving and less spending in the aggregate, which can help cool an economy suffering from high inflation. This behaviour is not specific to the ECB; it applies to all central banks.Isn’t it possible for banks to avoid the negative deposit rate? For example, can’t they simply decide to hold more banknotes?If a bank holds more money than is required for the minimum reserves and if it is not willing to lend to other commercial banks, it has only two options: to hold the money on an account at the central bank or to hold it as cash. But holding cash is not cost-free either − not least since the bank needs a very safe storage facility to warehouse the banknotes. So it is unlikely that any bank would choose to do this. The more likely outcome is that banks either lend money to other banks or pay the negative deposit rate.

via ECB: Why has the ECB introduced a negative interest rate?.

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Air Algérie crash takes owners of Hotel Ricardo

The sad news from the crash.  Among many others, the owners of the Hotel Ricardo lost their lives.  Leslie and I both knew Paulina, who worked for a long time as the nurse at the U.S. Embassy. She was a funny, wise-cracking, capable *doctor* (in our eyes).  I had not seen her for years, but we were just at the hotel (known for its wonderful swimming pool with a deep end and high dive) with my kids last year.   Condolences to the family.

Un couple de Français originaires du petit village de Tréville dans l’Aude et propriétaires d’un hôtel-restaurant à Ouagadougou fait partie des 118 victimes du crash de l’avion d’Air Algérie au Mali.  Richard Julia, 57 ans, propriétaire de l’hôtel Ricardo à Ouagadougou, était aussi pilote d’avion de tourisme chevronné. “Il lui arrivait de revenir en France depuis le Burkina avec son propre avion, ce qui lui permettait de le faire réviser à Marseille”, a expliqué à l’AFP, sous couvert de l’anonymat, un proche de la famille .. Le couple venait en vacances à Tréville  Avec son épouse Paulina, Française d’origine chilienne de 61 ans … Comme souvent l’été, le couple venait en vacances à Tréville, le village familial de Richard Julia niché au milieu des champs de tournesols dans cette région du Lauragais, près de Castelnaudary, a précisé le proche de la famille.  Ils venaient y retrouver les parents de Richard, ainsi que leurs deux enfants installés dans la région. Richard Julia et son épouse, infirmière de profession, avaient repris l’hôtel-restaurant des parents de Richard, l’hôtel Ricardo, un établissement d’une vingtaine de chambres avec piscine situé au bord du lac de Ouagadougou près du barrage numéro 2.

via Air Algérie : le couple d’Audois disparu tenait un hôtel à Ouagadougou.

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Teaching Macroeconomics: the long-term unemployed

From NY Times:

The long-term unemployment rate, which soared in 2009 to heights not seen since the Great Depression, is finally declining rapidly. The proportion of the work force that has been unemployed for at least 27 weeks has fallen to 1.98 percent, less than half the record high of 4.4 percent reached in 2010.

via A Drop in the Long-Term Unemployed.

A recent paper on long-term unemployment is “Are the Long-Term Unemployed on the Margins of the Labor Market?” Alan B. Krueger, Judd Cramer, and David Cho

This paper explores the plausibility of a unified explanation for the recent shifts in the price and real wage Phillips Curves and Beveridge Curve in the U.S.: namely, that the long-term unemployed, whose share of overall unemployment rose to an unprecedented level after the Great Recession, are on the margins of the labor force and therefore exert very little pressure on the job market and economy. The hypothesis we seek to test is that the long er workers are unemployed the less they become tied to the job market, either because, on the supply side, they grow discouraged and search for a job less intensively (e.g., Krueger and Mueller , 2011 ) or because, on the demand side, employers discriminate against the long-term unemployed, based on the (rational or irrational) expectation that there is a productivity – related reason that accounts for their long jobless spell…

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