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Graphical Perception Of Nonlinear Trends: Discrimination And Extrapolation, Lisa A. Best

Electronic Theses and Dissertations

This dissertation investigated several factors involved in the perception of nonlinear relationships in time series graphs. To model real-world data sets, the graphed data included different sample sizes and levels of variability, and represented different underlying trends. Graph format was also varied. The purpose of the experiments was to determine how these factors affect both trend discrimination and extrapolation accuracy, with the overall goal of determining what types of graphs are optimal in different situations. In Experiment 1, subjects viewed time series graphs on a computer screen and had to identify the type of trend that was present. Six trends …