A Note on the 'One Case per Stagger Position' Character of Common Multiple-Baseline Intervention Designs

Purpose: To overcome the constraint of common multiple-baseline designs that only one case per stagger position is permitted.Methods: Three alternative strategies for assigning more than one case to each stagger position are examined.Results: The three recommended strategies achieve the objective while maintaining the study’s internal and statistical-conclusion validities.Conclusions: ExPRT, a freely available Excel-based randomization-test package, can be used to assist in both the design and statistical analysis associated with each of the strategies.