Metapsy
To download only this data file: Metapsy.rds (89 KB)
To download all BEAR datasets, click here.
Description
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
| Characteristic | Estimate |
|---|---|
| Probability of significance | 43% |
| Relative probability of publication for |z| < 1.96 | 0.73 |
| Successful replication for |z| > 1.96 | 70% |
| Correct sign for |z| > 1.96 | 99% |
What do these terms mean?
- Probability of significance
- The reported value is the assurance: the proportion of significant results adjusted for publication bias.
- Relative probability of publication
- The relative probability of observing a result below the |z| = 1.96 threshold rather than above it. Values below one indicate lower observation probability below the conventional two-sided significance threshold.
- Successful replication
- The probability that an exact replication has the same sign and |z| greater than 1.96, conditional on the original result having |z| greater than 1.96.
- Correct sign
- The probability that the observed effect has the same direction as the true effect, conditional on an original result with |z| greater than 1.96.
