Integrated Dual Analysis of Quantitative and Qualitative High-Dimensional Data

Juliane Müller, Laura Garrison, Philipp Ulbrich, Stefanie Schreiber, Stefan Bruckner, Helwig Hauser, Steffen Oeltze-Jafra

View presentation:2021-10-27T17:15:00ZGMT-0600Change your timezone on the schedule page
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Common approaches in visual data analysis, such as the Dual Analysis Approach by Turkay et al., focus on quantitative data without accounting for the qualitative dimensions. This may overlook relevant relationships. In this work, we present a solution for extending this approach to the joint analysis of quantitative AND qualitative data. Our conceptual workflow starts with an overview about the dataset in dimension and item view, where all data are visualized together. Subset selection and analysis allows the user to select a data subset and to track the resulting changes in descriptive statistics. These steps may be reset or repeated.
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Dual Analysis approach, High-dimensional data, Mixed data, Mixed statistical analysis


The Dual Analysis framework is a powerful enabling technology for the exploration of high dimensional quantitative data by treating data dimensions as first-class objects that can be explored in tandem with data values. In this work, we extend the Dual Analysis framework through the joint treatment of quantitative (numerical) and qualitative (categorical) dimensions. Computing common measures for all dimensions allows us to visualize both quantitative and qualitative dimensions in the same view. This enables a natural joint treatment of mixed data during interactive visual exploration and analysis. Several measures of variation for nominal qualitative data can also be applied to ordinal qualitative and quantitative data. For example, instead of measuring variability from a mean or median, other measures assess inter-data variation or average variation from a mode. In this work, we demonstrate how these measures can be integrated into the Dual Analysis framework to explore and generate hypotheses about high-dimensional mixed data. A medical case study using clinical routine data of patients suffering from Cerebral Small Vessel Disease (CSVD), conducted with a senior neurologist and a medical student, shows that a joint Dual Analysis approach for quantitative and qualitative data can rapidly lead to new insights based on which new hypotheses may be generated.