A key goal of scientific studies is that they are replicable, i.e. they can be repeated with different data. A step towards this goal is reproducibility, which means enabling other researchers to repeat a study using the same data. In principle, data synthesis and simulation studies have fewer potential barriers to reproducibility and replicability than many experimental designs as they are predominantly performed within scientific computing environments. However, in practice mental health projects of this type frequently have low levels of both reproducibility and replicability.