Guerra Gomez, J., Buck-Coleman, A., Plaisant, C., Shneiderman, B.
A common data analysis task is to compare pairs of trees to
detect changes in leaf or interior node values and to identify
created and removed nodes. However even in trees with
just a dozen nodes it is difficult to find those differences. We
present TreeVersity, a new interactive visualization that gives
users powerful tools to detect both node value changes and
topological differences. TreeVersity uses dual comparison
techniques (side-by-side and explicit differences) and tabular
representations, to facilitate the understanding and navigation
of the differences. TreeVersity's design employs carefullydesigned
color palettes to show positive/negative, absolute,
and relative value changes; shapes that preattentively show these changes; and novel graphical approaches that highlight
created and removed nodes. We illustrate TreeVersity's functionality
through comparison of the 2011 and 2012 U.S. Federal
Budget. Eight usability test participants, with no initial
training, identified many differences between the two trees,
while suggesting improvements which were implemented.
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