The current study examined the convergent validity between the standardized PEAK Comprehensive Assessment (PCA) and the semi-standardized PEAK Pre-assessment (PEAK-PA). Twenty-two participants were administered each tool, and an item by item analysis was conducted to evaluate correlations between tests. The results suggested a strong positive correlation between the PEAK-PA and the PCA score (r = .967, p < .0001). Correlations between each subtest on the PCA and the PEAK-PA were all significant at .001 level. When looking at revised items on the PCA, individuals most often scored higher on the PEAK-PA than the PCA. The results suggested that although these two tests were highly correlated, the PCA may assess a boarder range of skills that were not previously captured by the PEAK-PA. Implications for practicing clinicians in the area of autism treatment are presented.
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Ackley, M., Subramanian, J. W., Moore, J. W., Litten, S., Lundy, M. P., & Bishop, S. K. (2019). A review of language development protocols for individuals with autism. Journal of Behavioral Education, 28(3), 362–388.
American Psychiatric Association (2013). Diagnostic and statistical manual of mental disorders (DSM-5®): American Psychiatric Pub.
Barron, B. F., Paliliunas, D., & Dixon, M. R. (2020). Evaluation of the PEAK-DT and PEAK-G Pre-assessments: Comparing directly implemented and indirect assessments of verbal abilities. Journal of Behavioral Education, 1–20.
Beavers, G. A., Iwata, B. A., & Lerman, D. C. (2013). Thirty years of research on the functional analysis of problem behavior. Journal of Applied Behavior Analysis, 46(1), 1–21.
Boyle, C. A., Boulet, S., Schieve, L. A., Cohen, R. A., Blumberg, S. J., Yeargin-Allsopp, M., … Kogan, M. D. (2011). Trends in the prevalence of developmental disabilities in US children, 1997–2008.Pediatrics, 127(6), 1034-1042.
Centers for Disease Control and Prevention (2014).Prevalence of Autism Spectrum Disorder Among Children Aged 8 Years - Autism and Developmental Disabilities Monitoring Network, 11 Sites, United States, 2010. Retrieved from https://stacks.cdc.gov/view/cdc/22182/cdc_22182_DS1.pdf
Cohen, H., Amerine-Dickens, M., & Smith, T. (2006). Early intensive behavioral treatment: Replication of the UCLA model in a community setting. Journal of Developmental & Behavioral Pediatrics, 27(2), S145–S155.
Cooper, J. O., Heron, T. E., & Heward, W. L. (2007).Applied behavior analysis: Pearson Education, Inc.
Dixon, M. R. (2014a). PEAK relational training system: direct training module. Carbondale, IL: Shawnee Scientific Press.
Dixon, M. R. (2014b). PEAK relational training system: Generalization module. Carbondale, IL: Shawnee Scientific Press.
Dixon, M. R. (2015). PEAK relaitonal training system: Equivalence module. Carbondale, IL: Shawnee Scientific Press.
Dixon, M. R. (2016). PEAK relational training system: Transformation module. Carbondale, IL: Shawnee Scientific Press.
Dixon, M. R. (2019). PEAK Comprehensive Assessment. Carbondale, IL: Shawnee Scientific Press.
Dixon, M. R., Belisle, J., Stanley, C., Rowsey, K., Daar, J. H., & Szekely, S. (2015). Toward a behavior analysis of complex language for children with autism: Evaluating the relationship between PEAK and the VB-MAPP. Journal of Developmental and Physical Disabilities, 27(2), 223–233.
Dixon, M. R., Belisle, J., & Stanley, C. R. (2018). Derived relational responding and intelligence: Assessing the relationship between the PEAK-E pre-assessment and IQ with individuals with autism and related disabilities. The Psychological Record, 68(4), 419–430.
Dixon, M. R., Carman, J., Tyler, P. A., Whiting, S. W., Enoch, M. R., & Daar, J. H. (2014). PEAK relational training system for children with autism and developmental disabilities: Correlations with Peabody Picture Vocabulary Test and assessment reliability. Journal of Developmental and Physical Disabilities, 26(5), 603–614.
Dixon, M. R., Paliliunas, D., Barron, B. F., Schmick, A. M., & Stanley, C. R. (2019). Randomized controlled trial evaluation of ABA content on IQ gains in children with autism. Journal of Behavioral Education, 1–23.
Dracobly, J. D., Dozier, C. L., Briggs, A. M., & Juanico, J. F. (2018). Reliability and validity of indirect assessment outcomes: Experts versus caregivers. Learning and motivation, 62, 77–90.
Hanley, G. P., Iwata, B. A., & McCord, B. E. (2003). Functional analysis of problem behavior: A review. Journal of Applied Behavior Analysis, 36(2), 147–185. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1284431/pdf/12858983.pdf
Ingvarsson, E. T., Cammilleri, A. P., & Macias, H. (2012). Emergent listener responses following intraverbal training in children with autism. Research in Autism Spectrum Disorders, 6(2), 654–664.
Koegel, L. K., Koegel, R. L., & Smith, A. (1997). Variables related to differences in standardized test outcomes for children with autism. Journal of Autism and Developmental Disorders, 27(3), 233–243.
Lord, C., Risi, S., & Pickles, A. (2004). Trajectory of language development in autistic spectrum disorders. In M. Rice & S. Warren (Eds.), Developmental Language DisordersL From Phenotypes to Etiologies (pp. 7–29). Mahwah, NJ: Lawerence Erlbaum Associates.
Lovaas, O. I. (1987). Behavioral treatment and normal educational and intellectual functioning in young autistic children. Journal of consulting and clinical psychology, 55(1), 3.
Malkin, A., Dixon, M. R., Speelman, R. C., & Luke, N. (2017). Evaluating the relationships between the PEAK relational training system–direct training module, Assessment of Basic Language and Learning Skills-Revised, and the Vineland Adaptive Behavior Scales–II. Journal of Developmental and Physical Disabilities, 29(2), 341–351.
Martin, N. T., Bibby, P., Mudford, O. C., & Eikeseth, S. (2003). Toward the use of a standardized assessment for young children with autism: Current assessment practices in the UK. Autism, 7(3), 321–330.
May, B. K., & Flake, L. (2019). PEAK Pre-Assessments: Preliminary Evidence Establishing Internal Consistency and Construct Validity. Behavior Analysis in Practice, 12(3), 627–631.
McEachin, J. J., Smith, T., & IvarLovaas, O. (1993). Long-term outcome for children with autism who received early intensive behavioral treatment. American journal of mental retardation, 97, 359–359.
McKeel, A., Dixon, M. R., Daar, J. H., Rowsey, K. E., & Szekely, S. (2015). Evaluating the efficacy of the PEAK relational training system using a randomized controlled trial of children with autism. Journal of Behavioral Education, 24(2), 230–241.
McKeel, A., Rowsey, K., Dixon, M. R., & Daar, J. H. (2015). Correlation between PEAK relational training system and one-word picture vocabulary tests. Research in Autism Spectrum Disorders, 12, 34–39. https://doi.org/10.1016/j.rasd.2014.12.007
Moore, J. W., Rizer, H. B., Warren, L. K., Yeager, M. G., Brewer, R. R., Barker, L. K., … Potter, M. (2019). An Initial Evaluation of an Assessment Method for the PEAK Relational System Direct Training Module. Behavior Analysis in Practice, 1–11.
National Autism Center (Producer) (2015). National Standards Project, Phase 2. Retrieved from https://www.nationalautismcenter.org/download/4773/
Odom, S. L., Boyd, B. A., Hall, L. J., & Hume, K. (2010). Evaluation of comprehensive treatment models for individuals with autism spectrum disorders. Journal of Autism and Developmental Disorders, 40(4), 425–436.
Ruble, L. A., Heflinger, C. A., Renfrew, J. W., & Saunders, R. C. (2005). Access and service use by children with autism spectrum disorders in Medicaid managed care. Journal of Autism and Developmental Disorders, 35(1), 3–13.
Sallows, G. O., & Graupner, T. D. (2005). Intensive behavioral treatment for children with autism: Four-year outcome and predictors. American Journal on Mental Retardation, 110(6), 417–438.
Sparrow, S. S., Cicchetti, D. V., & Saulnier, C. A. (2016). Vineland Adaptive Behavior Scales (3rd ed.). San Antonio, TX: The Psychological Corporation.
Sutton, A., Pikula, A., Yi, Z., & Dixon, M. R. (under review). Evaluating a standartized Language and Cognition Assessmenet: Correlation Between the PEAK Comprehensive Assessment and intelligent behavior, behavior challanges and autism symptom severity.
Virués-Ortega, J. (2010). Applied behavior analytic intervention for autism in early childhood: Meta-analysis, meta-regression and dose–response meta-analysis of multiple outcomes. Clinical psychology review, 30(4), 387–399.
Conflict of Interest
Mark R. Dixon receives small royalties from sales of the PEAK.
The content and procedure of this study was in accordance with the ethical standards as laid down in the 1964 Helsinki Declaration and was approved by the Human Subjects Committee at the Southern Illinois University Carbondale (Date: 08/13/19, Protocol: 15334).
Consent to Participate
Written informed consent was obtained from all participants’ parents or legal guardians.
Research was conducted at Southern Illinois University.
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Moore, J.L., Yi, Z., Hinman, J.M. et al. Examining the Convergent Validity Between the PEAK Relational Training System’s Semi-Standardized and Standardized Skill Assessments. J Dev Phys Disabil 33, 757–770 (2021). https://doi.org/10.1007/s10882-020-09771-9
- PEAK pre-assessment
- Standardized assessment