Very excited about this new paper from @jbgilbert.bsky.social! It uses item-level data to investigate why effect sizes are so much larger on measures created by researchers than ones developed by independent parties... www.tandfonline.com/doi/full/10....
Mechanisms of Effect Size Differences Between Researcher Developed and Independently Developed Outcomes: An Item-Level Meta-Analysis
Differences in effect sizes between researcher-developed (RD) and independently developed (ID) outcome measures are widely documented but poorly understood in education research. We conduct a meta-...
tandfonline.com