Axis Calibration for Improving Data Attribute Estimation in Star Coordinates Plots

• Published in: IEEE transactions on visualization and computer graphics Vol. 20; no. 12; pp. 2013 - 2022
• Main Authors: Rubio-Sanchez, Manuel, Sanchez, Alberto
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.12.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Calibration; Data visualization; Estimation error; Linear systems; Multivariate regression; RadViz; Data centering; Orthographic projection; Star Coordinates; Axis calibration; Attribute value estimation; Biplots
• ISSN: 1077-2626; 1941-0506
• DOI: 10.1109/TVCG.2014.2346258

Star coordinates is a well-known multivariate visualization method that produces linear dimensionality reduction mappings through a set of radial axes defined by vectors in an observable space. One of its main drawbacks concerns the difficulty to recover attributes of data samples accurately, which typically lie in the [0], [1] interval, given the locations of the low-dimensional embeddings and the vectors. In this paper we show that centering the data can considerably increase attribute estimation accuracy, where data values can be read off approximately by projecting embedded points onto calibrated (i.e., labeled) axes, similarly to classical statistical biplots. In addition, this idea can be coupled with a recently developed orthonormalization process on the axis vectors that prevents unnecessary distortions. We demonstrate that the combination of both approaches not only enhances the estimates, but also provides more faithful representations of the data.