Metapsy (psychotherapy)
To download only this data file: Metapsy.rds (89 KB)
To download all BEAR datasets, click here.
Metapsy (psychotherapy)
Studies included in Metapsy (https://www.metapsy.org/), a set of living meta-analytic databases of randomised trials of psychotherapeutic interventions.
Snapshot date: Jan 2026
Data availability: Metapsy is maintained by an international collaboration led by Vrije Universiteit Amsterdam. Databases are available at https://www.metapsy.org/ and via R package metapsyData (Harrer et al. 2022). Metapsy FAQ states that all data provided as part of the project are open-access and requires attribution.
Data processing: we merged 20 individual datasets in Metapsy with some cleaning (e.g. to extract study dates from titles). Almost all estimates are Hedges’ g, but for one of the databases (total-response) we converted log-odds ratios to SMD (dividing by \(\Pi/\sqrt{3}\) to scale SD of logistic regression). Signed z-values were computed as effect sizes divided by their standard errors.
Model of z-values
The fitted mixture model is shown over the empirical distribution of absolute z-values. The solid line is a mixture of half-normals, with selection. The dashed line shows the distribution without selection. If there are inequalities (e.g. studies reporting p < 0.05) the histogram resamples values from the appropriate set.
