Essay

Describe the single-subject research study by Hall and his colleagues regarding Robbie's study time. Specifically, explain how the percentage of non-overlapping data (PND) was calculated in this study, and state the final PND percentage that indicated a very strong treatment effect.

Question: Describe the single-subject research study by Hall and his colleagues regarding Robbie's study time. Specifically, explain how the percentage of non-overlapping data (PND) was calculated in this study, and state the final PND percentage that indicated a very strong treatment effect.

Sample answer: In the single-subject study by Hall and colleagues, Robbie's study time was measured during a baseline condition and a subsequent treatment condition. To calculate the Percentage of Non-Overlapping Data (PND), every treatment measurement was compared to the highest baseline measurement. Because every measurement of Robbie's study time in the treatment condition was strictly greater than the highest measurement in the baseline condition, the resulting PND was 100%, indicating a very strong treatment effect.

Key points:

  • The study is a single-subject research study by Hall and colleagues focusing on Robbie's study time.
  • PND is calculated by determining the percentage of treatment measurements that exceed the highest baseline measurement.
  • Every single measurement of study time during the treatment condition was strictly greater than the highest baseline measurement.
  • The calculated PND for this study was 100%.
  • A 100% PND indicates a very strong treatment effect.

Rubric: To receive full credit, the student must: 1) Identify the study as a single-subject design by Hall and colleagues; 2) Explain that PND calculation compares treatment measurements to the highest baseline measurement; 3) Note that every treatment measurement was strictly greater than the baseline maximum; and 4) State that the resulting PND was 100%, demonstrating a very strong treatment effect.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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