ABSTRACT
This chapter provides general guidelines for inspecting and interpreting line-graphed single case research data. It outlines a process for conducting a visual analysis addressing those properties of a data series that analysts have found helpful when analyzing data within and between conditions of a study. The chapter addresses each of these visual analysis components by defining terminology, describing how to compute each, and pointing out considerations and/or precautions. The visual analysis of graphic data, in contrast to statistical analysis of data, represents the most frequently used data analysis strategy employed with single case research designs. When visually analyzing data, or conducting research with these classes of behavior, a shorter baseline condition is understandable and tolerated, though demonstration of experimental control will be weakened. The visual analysis of data within a condition is concerned primarily with level and trend stability of the data.
