What does a high Percentage of Non Overlapping Data Points (PND) suggest?

• A. There is a weaker effect of the intervention
• B. The intervention is not effective
• C. There is a stronger effect of the intervention
• D. The data collection methods may be flawed

Answer: (C)

A high Percentage of Non Overlapping Data Points (PND) indicates a stronger effect of the intervention being applied. PND refers to the proportion of data points in the intervention phase that do not overlap with data points collected during the baseline phase. When the PND is high, it suggests that the behavior being measured has decreased significantly compared to baseline levels, demonstrating the effectiveness of the intervention.

This metric is often used in single-case research designs to assess treatment effects. A substantial amount of non-overlapping data typically signals that the intervention has resulted in a meaningful change in behavior, thus highlighting its strength and efficacy.