Linking and Brushing
in each of the plots. This is accomplished by highlighting these points in some fashion. For example, the highlighted points could be drawn as a filled circle while the remaining points could be drawn as unfilled circles. A typical application of this would be to show how an outlier shows up in each of the individual pairwise plots. Brushing extends this concept a bit further. In brushing, the points to be highlighted are interactively selected by a mouse and the scatterplot matrix is dynamically updated (ideally in real time). That is, we can select a rectangular region of points in one plot and see how those points arereflected in the other plots.
Brushing means interactively selecting a subset of the data items with an input device. This is usually done to highlight this subset, to delete it from the view or to de-emphasize it, if the user wants to focus on the other items.
Brushing is most useful in connection with linking. For instance when working on a scatterplot matrix, the user could brush some points in one plot. This causes the brushing–effect to be applied to the corresponding points in other plots.
- [Keim, 2004]: D. A. Keim, Information Visualization and Visual Data Mining, IEEE Transactions on Visualization and computer graphics, 2002.
- [Voigt, 2004]: R. Voigt, Linking and brushing, 2004.
- [Saake et al., 2000]: Gunter Saake, Kai-Uwe Sattler, Daniel Keim, Datenbank- und Visualisierungstechnologie in der Informationsfusion, Fakultät für Informatik, Universität Magdeburg, 2000.
- [NIST/SEMATECH, 2004]: NIST/SEMATECH e-handbook of statistical methods, 2004.