Abstract
This story is about multidimensional visualization with Parallel Coordinates (abbr. ||-coords) which transform the search for relations in multivariate datasets into a 2-dimensional pattern recognition problem. The discovery process is illustrated by finding:
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ground features from remote sensing satellite data, and
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useful rules for gold, foreign currencies and stockmarket trading from a nancial dataset.
A complex dataset with two categories is classified using a geometric classification algorithm based on ||-coords. The minimal set of variables required to state the rule is found and ordered by their predictive value. A visual model of a real country's economy is constructed showing how multivariate relations can be modeled by means of hypersurfaces. Interior points corresponding to feasible economic policies are constructed interactively finding that two sectors unknowingly compete for the same group of workers. An overview of modern ||-coords provides foundational understanding. The representation of an M-dimensional hypersurface is obtained from its (M−1) subsets which are constructed recursively from its points. There are examples of surfaces where convexity can be seen in any dimension as well as non-orientability(as in the Möbius strip), and features like folds, crevices, bumps which are hidden or distorted in other types of displays. This is a prelude of what is on the way: recursive multidimensional interactivity for uncovering the secrets in massive datasets.
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Notes
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1 The venerable name “Exploratory Data Analysis” EDAis used interchangeably with the currently more fashionable “Visual Data Mining.”.
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2 MDG'’s Ltd proprietary software -– All Rights Reserved, is used by permission.
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3 Suggesting that the Landsat Thematic mapper band 4 filters out water though unknown to me.
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4 I am grateful to Prof. R. Coiffman and group at the Math./CS Depts Yale University for this dataset.
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Inselberg, A. (2009). Parallel Coordinates: Interactive Visualisation for High Dimensions. In: Liere, R., Adriaansen, T., Zudilova-Seinstra, E. (eds) Trends in Interactive Visualization. Advanced Information and Knowledge Processing. Springer, London. https://doi.org/10.1007/978-1-84800-269-2_3
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