Calculating Effect Sizes for Single Subject Designs

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# Calculating Effect Sizes for Single Subject Designs - PowerPoint PPT Presentation

8.1. Calculating Effect Sizes for Single Subject Designs. Classes of Effect Size Formulae . Percentage of Non-Overlapping Data (PND) Identify the lowest baseline point Count the number of non-overlapping intervention points

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8.1

### Calculating Effect Sizes for Single Subject Designs

Classes of Effect Size Formulae

Percentage of Non-Overlapping Data (PND)

• Identify the lowest baseline point
• Count the number of non-overlapping intervention points
• Calculate the proportion of non-overlapping to total number of intervention points (can’t use if baseline has a zero point)
Classes of Effect Size Formulae

Standard Mean Difference

• Subtract the mean of the baseline phase from the mean of the intervention phase
• Divided by standard deviation of baseline

SMDall= 7.23

SMD3= 8.25

Classes of Effect Size Formulae

Percentage Reduction (mean baseline reduction)

• Subtract the average of last 3 Tx points from the average of the last 3 baseline points
• Divide by the average of the last 3 baseline points
• Multiply by 100 for percent of baseline reduction
Classes of Effect Size Formulae

Regression Models

• Regression equation obtained for baseline
• Regression equation obtained for Tx data
• Tx substracted from baseline and divided by standard deviation of baseline