Parallel sets: interactive exploration and visual analysis of categorical data. Kosara, R., Bendix, F., & Hauser, H. IEEE transactions on visualization and computer graphics, 12(4):558–568, United States, August, 2006.
doi  abstract   bibtex   
Categorical data dimensions appear in many real-world data sets, but few visualization methods exist that properly deal with them. Parallel Sets are a new method for the visualization and interactive exploration of categorical data that shows data frequencies instead of the individual data points. The method is based on the axis layout of parallel coordinates, with boxes representing the categories and parallelograms between the axes showing the relations between categories. In addition to the visual representation, we designed a rich set of interactions. Parallel Sets allow the user to interactively remap the data to new categorizations and, thus, to consider more data dimensions during exploration and analysis than usually possible. At the same time, a metalevel, semantic representation of the data is built. Common procedures, like building the cross product of two or more dimensions, can be performed automatically, thus complementing the interactive visualization. We demonstrate Parallel Sets by analyzing a large CRM data set, as well as investigating housing data from two US states.
@article{kosara_parallel_2006,
	address = {United States},
	title = {Parallel sets: interactive exploration and visual analysis of categorical data.},
	volume = {12},
	issn = {1077-2626},
	doi = {10.1109/TVCG.2006.76},
	abstract = {Categorical data dimensions appear in many real-world data sets, but few visualization methods exist that properly deal with them. Parallel Sets are a new  method for the visualization and interactive exploration of categorical data that  shows data frequencies instead of the individual data points. The method is based  on the axis layout of parallel coordinates, with boxes representing the  categories and parallelograms between the axes showing the relations between  categories. In addition to the visual representation, we designed a rich set of  interactions. Parallel Sets allow the user to interactively remap the data to new  categorizations and, thus, to consider more data dimensions during exploration  and analysis than usually possible. At the same time, a metalevel, semantic  representation of the data is built. Common procedures, like building the cross  product of two or more dimensions, can be performed automatically, thus  complementing the interactive visualization. We demonstrate Parallel Sets by  analyzing a large CRM data set, as well as investigating housing data from two US  states.},
	language = {eng},
	number = {4},
	journal = {IEEE transactions on visualization and computer graphics},
	author = {Kosara, Robert and Bendix, Fabian and Hauser, Helwig},
	month = aug,
	year = {2006},
	keywords = {*Computer Graphics, *Data Display, *Databases, Factual, *Models, Statistical, *User-Computer Interface, Computer Simulation, Data Interpretation, Statistical, Image Interpretation, Computer-Assisted/*methods, Information Storage and Retrieval/*methods},
	pages = {558--568},
}

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