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Issue No. 07 - July (2012 vol. 18)
ISSN: 1077-2626
pp: 1089-1100
Leishi Zhang , Fachbereich Inf. und Informationswissenschaft, Univ. Konstanz, Konstanz, Germany
P. Rodgers , Sch. of Comput., Univ. of Kent, Canterbury, UK
H. Purchase , Sch. of Comput. Sci., Univ. of Glasgow, Glasgow, UK
Euler diagrams are often used to visualize intersecting data sets in applications such as criminology; genetics, medicine, and computer file systems. One interesting aspect of these diagrams is that some data sets cannot be drawn without breaking one or more "wellformedness properties,” which are considered to reduce the user comprehension of the diagrams. However, it is possible to draw the same data with different diagrams, each of which breaks different wellformedness properties. Hence, some properties are "swappable,” so motivating the study of which of the alternatives would be best to use. This paper reports on the two empirical studies to determine how wellformedness properties affect comprehension. One study was with abstract data, the other was with concrete data that visualized students' enrollment on university modules. We have results from both studies that imply that diagrams with concurrency or disconnected zones perform less well than other some other properties. Further, we have no results that imply that diagrams with brushing points adversely affect performance. Our data also indicate that nonsimple curves are preferred less than diagrams with other properties. These results will inform both human diagram designers and the developers of automated drawing systems on the best way to visualize data using Euler diagrams.
data visualisation, automated drawing systems, wellformedness properties, Euler diagrams, intersecting data sets visualization, criminology, genetics, medicine, computer file systems, comprehension, student enrollment visualization, university modules, brushing points, human diagram designers, Handheld computers, Decision support systems, information visualization., Euler diagrams, Venn diagrams, empirical studies

Leishi Zhang, P. Rodgers and H. Purchase, "Wellformedness Properties in Euler Diagrams: Which Should Be Used?," in IEEE Transactions on Visualization & Computer Graphics, vol. 18, no. , pp. 1089-1100, 2012.
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