Visualizing Information by Riccardo Mazza

By Riccardo Mazza

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These values are respectively mapped onto the x-axis and y-axis. Furthermore, they seek to report the number of inhabitants (mapped to the dimension of the graphical elements) and the continent to which each nation belongs (mapped to the color of the graphical element). One immediately notices an almost linear correlation between the wealth and the state of health: The state of health improves with an increase in the wealth in the population. ), despite the wealth as being comparable to that of India.

This aspect, called postattentive processing, was studied by Wolfe et al. [68]. They ran some experiments and found that attention has no cumulative effects on visual perception. In other words, if a viewer looks at one scene numerous times and then looks at something else, the new preattentive representation (or postattentive representation) of an object appears to be identical to its representation before the viewer focused his attention on it. The preattentive visual perception doesn’t save any information about the scene.

In Fig. 4, for example, we have brushed the automobiles that have less than 200 horsepower. Through brushing, we can deduce that all of the automobiles with this characteristic have 8 cylinders, were manufactured in the same country and, curiously, were all produced before 1973. 2 Scatterplot Matrix Scatterplot matrices represent an interesting extension to the common 2D scatterplot, to simply and intuitively represent a generic number of multivariate attributes. 2 Geometric Techniques 51 Fig. 5 Scatterplot matrices present multivariate data very simply and intuitively.

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