Tuesday, September 6, 2011

Reaction: Graphical Perception - Theory, Experimentation, and Application to the Development of Graphical Methods

Data representation, visualization and abstraction normally take the form of a graph.Graphical representation of data varies in forms. The perception of a given graph change from individual to individual. The degree of perception relates how accurately data is understood and differentiated.What forms of representation are the best, could be established by empirical or experimental evidence. These experiments are psycho-physical and complex since it tries to quantify the results of
There is a need to break up complexity of perception of graphical representation into simple levels of abstraction. Hypothesis framed on simplified levels will lead to an initial simple model. Such a model may not be sufficient to derive a complete order of best or most effective graphical presentation. But validation and verification of theory derived from such a model may result in building up additional ordered parameters to improve the efficiency of graphical representation of data. A ‘line’, ‘area’, ‘volume’ order of perception may appear to be a logical order of best to least superiority. But factors like “is position judgement is superior compared with length judgement or angle judgment”, is examined in this paper.

Q1. To judge the level of accuracy author has used log2(|judged percent - true percent | + 1/8). What is basis of this formula for measurement?
Q2. Statistical tests and distribution in the experiment (and related analysis) require more detailed reading for understanding. What could be an ideal reading material for this?