Data depth functions for non-standard data by use of formal concept analysis

Blocher, Hannah und Schollmeyer, Georg (2025): Data depth functions for non-standard data by use of formal concept analysis. In: Journal of Multivariate Analysis, Bd. 205, 105372

Abstract

In this article we introduce a notion of depth functions for data types that are not given in standard statistical data formats. We focus on data that cannot be represented by one specific data structure, such as normed vector spaces. This covers a wide range of different data types, which we refer to as non-standard data. Depth functions have been studied intensively for normed vector spaces. However, a discussion of depth functions for non-standard data is lacking. In this article, we address this gap by using formal concept analysis to obtain a unified data representation. Building on this representation, we then define depth functions for non-standard data. Furthermore, we provide a systematic basis by introducing structural properties using the data representation provided by formal concept analysis. Finally, we embed the generalised Tukey depth into our concept of data depth and analyse it using the introduced structural properties. Thus, this article presents the mathematical formalisation of centrality and outlyingness for non-standard data and increases the number of spaces in which centrality can be discussed. In particular, we provide a basis for defining further depth functions and statistical inference methods for non-standard data.

• Dokumententyp: Zeitschriftenartikel
• Keywords: Conceptual scaling; Depth functionFormal concept analysis; Generalised Tukey depth; Non-standard data
• Fakultät: Mathematik, Informatik und Statistik > Statistik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 510 Mathematik
• ISSN: 1095-7243
• Bemerkung: online 19 September 2024
• Sprache: Englisch