Improvement Rate Difference meta-analysis

Research Method · All research methods
Evidence · 3 claims (3 for) · 1 study (1 quant-synthesis), q3 · 0 of 1 report an effect size · 3 claims rest on one study

Description

This element is the meta-analysis itself: the authors synthesized "Twenty-four single-case studies" on aided AAC with individuals with ASD "via an effect size measure, the Improvement Rate Difference (IRD)." The IRD is used to quantify improvement across single-case designs, a literature base the authors describe as dominated by single-case research "with small numbers of participants." The analysis addressed three research questions concerning overall impact, individual targeted behavioral outcomes, and effects of three types of AAC interventions.

Accounts

• Improvement Rate Difference (IRD) meta-analysis of 24 single-case aided AAC studies: This element is the meta-analysis itself: the authors synthesized "Twenty-four single-case studies" on aided AAC with individuals with ASD "via an effect size measure, the Improvement Rate Difference (IRD)." The IRD is used to quantify improvement across single-case designs, a literature base the authors describe as dominated by single-case research "with small numbers of participants." The analysis addressed three research questions concerning overall impact, individual targeted behavioral outcomes, and effects of three types of AAC interventions. (Ganz et al. (2012))

Claims

• Aided AAC interventions had large effects on targeted behavioral outcomes in individuals with ASD, per a meta-analysis of 24 single-case studies [+M]
• AAC interventions showed positive effects on all targeted behavioral outcomes, with greater effects for communication skills than other skill categories [+M]
• PECS and speech-generating devices produced larger effects than other picture-based AAC systems, which nonetheless showed small effects [+M]

Related Research Methods

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Key Sources

• Ganz, J. B., Earles-Vollrath, T. L., Heath, A. K., Parker, R. I., Rispoli, M. J., & Duran, J. B. (2012). A Meta-Analysis of Single Case Research Studies on Aided Augmentative and Alternative Communication Systems with Individuals with Autism Spectrum Disorders. J Autism Dev Disord 42, 60–74. https://doi.org/10.1007/s10803-011-1212-2

Page metadata

Field	Value
type	research-method
id	improvement-rate-difference-meta-analysis
title	Improvement Rate Difference meta-analysis
description	This element is the meta-analysis itself: the authors synthesized "Twenty-four single-case studies" on aided AAC with individuals with ASD "via an effect size measure, the Improvement Rate Difference (IRD)." The IRD is used to quantify improvement across single-case designs, a literature base the au
status	review
generated	by process:settle-candidates on 2026-10-14
trust	unverified — no one has confirmed this page's content

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