Replication and methodological comments

Cold Showers and work absence
Adema, J., Adriaan ter Braak
A study published in PLOS ONE finding that cold showers strongly decrease work absence has implausible descriptive statistics, uses an incorrect statistical model, and has undeclared conflicts of interest.
Criminalization of purchasing sex and rape in Sweden
A study published in JPOBE finding large effects of criminalization of prostitution on rape estimates an impossible RDD specification, which effectively identifies a seasonal effect rather than a discontinuity.
The Political Effects of (Mis)perceived Immigration: a Comment
Adema, J.
A study published in the Journal of Economic Geography on the political effects of perceived immigration in Italian municipal elections constructs a shift-share exposure index that is mechanically correlated with municipality size. Controlling for electorate size renders all main results insignificant.
The Welfare Magnet Hypothesis: Evidence from an Immigrant Welfare Scheme in Denmark: Comment
A study published in AER Insights finding a large effect of welfare benefits on non-EU migration to Denmark reports an ill-defined elasticity, conflates net migration with migrant residents turning 30, and disregards the origin country composition of migration flows.

Participation in replication projects

I participate in several replication projects and many-analyst studies that aim to improve the credibility and reproducibility of social science research: