Parallel coordinates and scatter plot matrix are the same thing, except one is around a central point and the other is spread out horizontally.
Parallel coordinates are a popular method for visualizing and analyzing high-dimensional datasets. To represent a set of points in n-dimensional space, a background consisting of n parallel lines, usually vertical and equally spaced, is drawn.
Parallel coordinates plots are ideal for comparing many variables and seeing relationships between them. For example, if you need to compare a set of products with the same attributes (comparing specs of different models of computers or cars).
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