Abstract
In single-case research designs (SCDs) to determine a functional relation a time-series graph is constructed. Preliminary evidence suggest the approach used to scale the vertical axis and the data points per x- to y-axis ratio (DPPXYR) impact visual analysts’ decisions. We conducted a systematic review to evaluate time-series graphs published in the last decade in four premier journals in the field of autism. We included 348 articles including 2675 graphs. We identified large variation across and within types of SCDs when evaluating the lengths of the vertical and horizontal axis using the y:x ratio and the DPPXYR, with few adhering to current recommendations. A majority of graphs used an appropriate method to scale the vertical axis that would not increase Type I error rates.
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All authors contributed to the study's conception and design. Screening and coding of articles were conducted by all study authors. The first draft of the introduction was lead by RM with AH providing support. The first draft of the method and results was lead by CP with support from AD. The first draft of the discussion was lead by AD with feedback from the other authors. CP took primary responsibility for revising the final manuscript. All authors approved the final manuscript before acceptance.
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Peltier, C., Muharib, R., Haas, A. et al. A Decade Review of Two Potential Analysis Altering Variables in Graph Construction. J Autism Dev Disord 52, 714–724 (2022). https://doi.org/10.1007/s10803-021-04959-0
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DOI: https://doi.org/10.1007/s10803-021-04959-0