A survey of publication practices of single-case design researchers when treatments have small or large effects.

The published literature often underrepresents studies that do not find evidence for a treatment effect; this is often called publication bias. Literature reviews that fail to include such studies may overestimate the size of an effect. Only a few studies have examined publication bias in single-case design (SCD) research, but those studies suggest that publication bias may occur.

A demonstration of how to do a meta-analysis that combines single-case designs with between-groups experiments: The effects of choice making on challenging behaviors performed by people with disabilities.

Objective: This paper demonstrates how to conduct a meta-analysis that includes both between-group and single-case design (SCD) studies. The example studies whether choice-making interventions decrease challenging behaviors performed by people with disabilities.

Methods: We used a between-case d-statistic to conduct a meta-analysis of 15 between-group and SCD studies of 70 people with a disability, who received a choice intervention or control.