Archetypal cases for questionnaires with nominal multiple choice questions
Abstract
Archetypal analysis serves as an exploratory tool that interprets a collection of observations as convex combinations of pure (extreme) patterns. When these patterns correspond to actual observations within the sample, they are termed archetypoids. For the first time, we propose applying archetypoid analysis to nominal observations, specifically for identifying archetypal cases from questionnaires featuring nominal multiple-choice questions with a single possible answer. This approach can enhance our understanding of a nominal data set, similar to its application in multivariate contexts. We compare this methodology with the use of archetype analysis and probabilistic archetypal analysis and demonstrate the benefits of this methodology using a real-world example: the German credit dataset.
Keywords
Cite
@article{arxiv.2601.05392,
title = {Archetypal cases for questionnaires with nominal multiple choice questions},
author = {Aleix Alcacer and Irene Epifanio},
journal= {arXiv preprint arXiv:2601.05392},
year = {2026}
}
Comments
Statistical Methods for Data Analysis and Decision Sciences. Third Conference of the Statistics and Data Science Group of the Italian Statistical Society. Milan, April 2-3, 2025