Ongoing Projects

Ongoing projects led by Lab²

2026

A community-driven, crowd-science initiative spanning Germany, Austria, and Switzerland - this study connects 20 experimental labs to propose and evaluate experimental designs, ensuring that the highest-rated study is implemented consistently across all locations using standardized materials and procedures. Such large-scale coordination enables high-powered meta-analytic tests and the estimation of population heterogeneity across participating laboratories, accelerating the accumulation of robust evidence in the field by coordinating data collection across many labs simultaneously. .

2025

#ManyDaughters

A large-scale, collaborative study bringing together 127 research teams worldwide to test shared hypotheses on how having daughters influences behavior and preferences, using data from the German Socio-Economic Panel (SOEP). We completed data collection and are currently in the stage of implementing the (meta-)analyses specified in the pre-analysis plan (PAP) and drafting the first iteration of the paper..

Does Having Daughters Affect Political Preferences? A High-Powered Meta-Analysis of Many Surveys

This study estimates effect sizes for 39 countries in the European Social Survey (n = 156,236) and aggregates estimates using random-effects meta-analysis, following a preregistered analysis plan. It finds small but statistically significant increases in support for gender equality and homosexual rights, no meaningful effects on left-right ideology or income redistribution, and generally low cross-country heterogeneity, indicating that results are broadly consistent across the included countries..

Yifan YangMagnus JohannessonAnna DreberFrank M. FossenLevent NeyseFelix Holzmeister

Pre-Registration and Pre-Analysis Plans in Experimental Economics

This study examines the adoption of pre-registration in experimental economics using trends in journal publications and survey data from 519 researchers. Findings show pre-registered papers increased from 7 to 190 per year, 86% of surveyed researchers have pre-registered at least one study, and strong support for open science practices grows alongside a demand for clearer guidance on best practices..

Taisuke ImaiSéverine ToussaertAurélien BaillonAnna DreberSeda ErtacMagnus JohannessonLevent NeyseMarie Claire Villeval