Resumen: The present work aims at analyzing issues related to the data manifold dimensionality. The interest of the study is twofold: (i) first, when too many measurable variables are considered, manifold learning is expected to extract useless variables; (ii) second, and more important, the same technique, manifold learning, could be utilized for identifying the necessity of employing latent extra variables able to recover single-valued outputs. Both aspects are discussed in the modeling of materials and structural systems by using unsupervised manifold learning strategies. Idioma: Inglés DOI: 10.5802/CRMECA.53 Año: 2021 Publicado en: COMPTES RENDUS MECANIQUE 348, 10-11 (2021), 937-958 ISSN: 1631-0721 Factor impacto JCR: 1.437 (2021) Categ. JCR: MECHANICS rank: 115 / 138 = 0.833 (2021) - Q4 - T3 Factor impacto CITESCORE: 3.8 - Materials Science (Q2) - Engineering (Q2)