Retrieving Planned Sample Sizes from AsPredicted Preregistrations

It is increasingly common for researchers to preregister their studies ( Spitzer and Mueller 2023 ; Imai et al. 2025 ) . As preregistration is a new practice, it is not surprising that it is not always implemented well. One challenge is that researchers do not always indicate where they deviated from their preregistration when reporting results from preregistered studies ( Akker et al. 2024 ) .…