Promoting generalization and maintenance in augmentative and alternative communication: A meta-analysis of 20 years of effectiveness research

By Ralf Schlosser, David Lee. 2000

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Application of the percentage of non-overlapping data (PND) in systematic reviews and meta-analyses: A systematic review of reporting characteristics (2008, methodology): “…(e.g. including maintenance data as part of the treatment phase; Wehmeyer, 1995; Table 1); for instance, some investigators calculated non-overlap with baseline (e.g. Scotti et al., 1991) whereas others calculated overlap with parts of the intervention phase, or both (Schlosser & Lee, 2000).”
A review of meta-analyses of single-subject experimental designs: Methodological issues and practice (2008, methodology): “Algozzine, Browder, & Karvonen, 2001 ; Schlosser & Lee, 2000 ).”
Meta-Analysis of Math Interventions for Students With Emotional and Behavioral Disorders (2008, background): “In cases in which a ceiling effect was present because of students’ reaching 100% math accuracy in baseline, Schlosser and Lee (2000) recommend that PND be calculated with the data points that matched the highest baseline, which has to be 100% with a ceiling effect.”