Evidence of widespread p-hacking and publication bias in MTurk studies

docs.iza.org/dp15478.pdf by Abel Brodeur, @nikolaimcook, Anthony Heyes

🧵1/ The evidence for p-hacking and publication bias is particularly strong for MTurk studies in Marketing

2/

Strong evidence of employer discrimination against veiled Muslim women in 🇳🇱:

🔹almost 70% of job applications that included a photograph such as the one on the left received a positive callback

🔹only 35% if a photograph was included such as the one on the right

🧵 1/ Quite similar results are found for Germany.

In Spain, the level of discrimination against veiled Muslim women is much smaller and not statistically significant.

2/

What happens to labor earnings after becoming a parent?

This is still very different for women and men.

Take Germany.

Women experience a big drop in earnings after first childbirth — almost 80% in the short run and 60% in the long run.

For men, there is no drop.

🧵1/7 Germany is an extreme case, but sizeable "motherhood penalties" have also been found for Denmark, Sweden, the UK, the US.

Source: aeaweb.org/articles?id=10… by Henrik Kleven, @landais_camille, @JohannaPosch, Andreas Steinhauer, and Josef Zweimüller (2019)

🧵2/7

Shocking paper about the industry that handles over 80% of global goods trade: the maritime shipping industry: papers.ssrn.com/sol3/papers.cf… by Guillaume Vuillemey

The paper documents what happens to "end-of-life ships"...

thread 1/ "almost all ships globally are dismantled in poor environmental conditions after being “beached” on the shores of Bangladesh, India or Pakistan"

Moreover, "a fast-growing number of shipping companies use “last-voyage flags”...

2/

People do not trust economists, we hear that all the time.

For instance, Esther Duflo recently argued that “economists have lost most of their credibility” citing YouGov data from 🇬🇧 media.eur.nl/Mediasite/Play…

However, slightly newer data give rise to some optimism!

Thread (1/n) The newer data are also from YouGov in the UK, collected in April 2017, and commissioned by @economics_net and @ing_economics.

Full report: economicsnetwork.ac.uk/research/under…

The questionnaire contains more detailed questions about what people think about economists and economics.

(2/n)

New great paper by Janet Currie, Henrik Kleven, and Esmee Zwiers @ZwiersEsmee documents methodological changes in applied microeconomics in the last 4 decades: aeaweb.org/conference/202…

Thread with some great graphs 👇 (1/n) Applied Microeconomics has become very dominant in the Top 5 journals:

75% of papers in the Top 5 can be classified as applied microeconomics nowadays

(2/n)

A few years ago, a study found strong evidence for discrimination against female migrants wearing headscarves in Germany:

ftp.iza.org/dp10217.pdf by Doris Weichselbaumer, forthcoming in ILR Review

Thread (1/4)

Call-back rates for job interview: The study has now been replicated in the Netherlands, finding strong evidence for discrimination:

doi.org/10.1080/136918… by @RamosMa_, @LexThijssen, and @MarcelCoenders in a special issue of @scmrjems edited by @BramLancee

(2/4)

Call-back rates for job interview:

Did you see this graph by Kleven et al. (2018) showing that earnings of men and women in Denmark diverge sharply right after the arrival of the first child?

Kleven et al. (2019) now studied the same for Sweden, Germany, Austria, the UK, and the US.

And guess what? (1/6) The divergence is even sharper in these countries.

Below you see Denmark and Sweden.

The short-run earnings penalty is about twice as large in Sweden as it is in Denmark. (2/6)