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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

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classes of effect size formulae
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 formulae4
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
slide5

SMDall= 7.23

SMD3= 8.25

classes of effect size formulae6
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 formulae8
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