2A. From Data Analysis to Data Science

14:30 - 15:40, Aula 9

Organizer: Ndeye Niang

Chair: Ndeye Niang

Optimal Scaling: New Insights Into an Old Problem

Gilbert Saporta

Abstract: Processing qualitative variables with a very large number of categories in Machine Learning is an opportunity to revisit the theory of optimal scaling and its applications.

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Linear Approximation For Multivariate Categorical Functional Data Analysis

Cristian Preda and Quentin Grimonprez

Abstract: Multivariate categorical functional data is considered in the framework of dimension reduction through principal component analysis. Each statistical unit is represented by a vector of categorical functions observed on some time interval [0,T]. The computational algorithm for the optimal encoding functions and principal components is then adapted through a linear approximation for the encoding functions. A numerical study using Markov simulated data illustrates the accuracy of such an approximation.

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An overview of multi-view clustering approaches

Mohamed Nadif

Abstract: Various clustering models and algorithms derived from different perspectives are valuable for analyzing data collected from various sources or represented in multiple ways, each offering a unique insight into the data; see for instance [3, 1]. Therefore, when dealing with such data, many approaches can be used, such as factorization techniques [5], probabilistic methods [6, 4, 7], or even deep neural networks [2]. The effectiveness of clustering algorithms typically depends on how the data is represented, emphasizing the importance of learning a suitable data representation. Consequently, integrating these two tasks is a common strategy for exploring this type of data. This presentation will explore, discuss, and demonstrate the range of approaches employed, ranging from traditional to cutting-edge methods.

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A work by Gianluca Sottile

(on behalf of the local organizing committee)