Previous visual analysis research reported that the overall agreement between visual analysis and statistical analysis was poor. In response, some researchers suggested the use of celeration lines to improve the accuracy and reliability of visual analysis. However, subsequent research reported little or no improvement in accuracy with such lines.…

The reliability of visual inspection in single-case research was investigated by determining agreement among 5 judges visually inspecting 44 graphs depicting behavior from baseline to intervention. Agreement between visual inspection and statistical procedures was determined. Implications for single-case research are discussed. (SLD)