Definition: Computing a Z-score is a statistical approach mainly used to obtain the ‘Estimated Replication Rate’ (ERR) and ‘Expected Discovery Rate’ (EDR) for a set of reported studies. Calculating a z-curve for a set of statistically significant studies involves converting reported p-values to z-scores, fitting a finite mixture model to the distribution of z-scores, and estimating mean power based on the mixture model. The Z-curve analysis can be performed in R through a dedicated package - https://cran.r-project.org/web/packages/zcurve/index.html.

Related terms: Altmetrics, File drawer ratio, P-curve, P-hacking, Replication, Statistical power

References: Bartoš and Schimmack (2020), & Brunner and Schimmack (2020)

Drafted and Reviewed by: Bradley J. Baker, Kamil Izydorczak, Sam Parsons, Charlotte R. Pennington, Mirela Zaneva

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