**Manuscript and Supplements** Download [manuscript here][1] or view the supplement packets below: - [Included_Effects][2] lists each study replicated as part of the project. - [Coordinating Proposal][3] is an early proposal/recruitment document. - [SourceInfo][4] is a spreadsheet describing conditions of data collection per site. - The sub-Wiki page [here][5] provides more detail about this document. - [WEIRD Nations][6] is a spreadsheet showing the calculations that define which samples are considered WEIRD or not. - The sub-Wiki page [here][7] provides more detail about this document. - [Pre-registered proposal and analysis plan][8]. - [Post-Registration Changes][9] details all procedural changes made after the proposal was pre-registered. - [PoPS Supplementary Notes][10] details all analytic changes from the pre-registered analysis plan. - [Site Demographics][11] reports demographic information broken down by site. - [Max I2 Calculation][12] is a demonstration of the noted "I2 paradox" where samples with little visible heterogeneity can show high I2. - [ML2 Code Review][13] shows results from an internal review of the analysis script. [1]: https://journals.sagepub.com/doi/10.1177/2515245918810225 [2]: https://osf.io/ybdju/ [3]: https://osf.io/uazdm/ [4]: https://osf.io/uv4qx/ [5]: https://osf.io/ux3eh/wiki/ML2%20SourceInfo%20README/ [6]: https://osf.io/b7qrt/ [7]: https://osf.io/ux3eh/wiki/ML2%20WEIRD%20Nations%20README/ [8]: https://osf.io/ejcfw/ [9]: https://osf.io/7mqba/ [10]: https://osf.io/4rbh9/ [11]: https://osf.io/g3bza/ [12]: https://osf.io/frbuv/ [13]: https://osf.io/54uef/