Effect Size Activity Consider the study:

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Presentation transcript:

Effect Size Activity Consider the study: Wright, L. A., & McCathren, R. B. (2012). Utilizing Social Stories to Increase Prosocial Behavior and Reduce Problem Behavior in Young Children with Autism. Child Development Research. Graphs from the article showing the number of peer interactions over time during baseline, social story intervention, modified social story intervention, and maintenance conditions are shown on the next slides for each of the four children (Nick, Logan, Trevor, and Peter). One slide shows instances of positive peer interactions and one shows instances of negative peer interactions.

Positive peer interactions

Negative peer interactions

Instructions, part 1 Estimate the effects from baseline to initial social story on the number of instances of positive peer interaction by computing SMD, LRR, PND, and NAP for each child. Estimate the effects from baseline to initial social story for the number of instances of negative peer interaction by computing SMD, LRR, PND, and NAP for each child. Which of the effect sizes corresponds most closely with your visual analysis of the effects? Which provides the most sensible description of the magnitude of effect? Effect Size Calculator: https://jepusto.shinyapps.io/SCD-effect-sizes/ Positive peer interactions Negative peer interactions SMD LRR PND NAP Nick Logan Trevor Peter

Instructions, part 2 Estimate the effects from initial social story to modified social story on the number of instances of positive peer interaction by computing SMD, LRR, PND, and NAP for each child. Estimate the effects from initial social story to modified social story for the number of instances of negative peer interaction by computing SMD, LRR, PND, and NAP for each child. Which of the effect sizes corresponds most closely with your visual analysis of the effects? Which provides the most sensible description of the magnitude of effect? Effect Size Calculator: https://jepusto.shinyapps.io/SCD-effect-sizes/ Positive peer interactions Negative peer interactions SMD LRR PND NAP Nick Logan Trevor Peter

Instructions, part 3 For your preferred effect size index(es), compute the simple fixed effects average effects across the four cases, along with standard errors. Do separate calculations for the ES comparing baseline to initial social story and for the ES comparing initial to modified social story. How would you interpret the average ES estimate in the context of this study?