Egg volumes of Parus major in Sagunto Valencia Spain from 1988-1994

These files are associated with the analyses contained in the preprintSocias-Martínez, L., Álvarez, E., Peckre, L. R., & Barba, E. (2025). Unveiling clutch investment strategies in birds: A case study on great tits using generalized additive models (Versión 2). Zenodo. https://doi.org/10.5281/zenodo.14892366 What: It contains measurements of egg volume from individual eggs collected in a population of Great tits (Parus major) and the R scripts used to fit, evaluate, plot predictions against original data and evaluate the autocorrelation in residuals with use of custom functions for all Generalised additive models used in the preprint.Who: Emilio Barba measured all eggs and Emilio Barba (Universitat de Valencia, Cavanilles Institute for Evolutionary Biology, Spain) and Elena Álvarez (same affiliation) curated the dataset. Lluís Socias-Martínez (INU Champollion, France) created the data files and the R scripts used in the preprint from the database that Emilio and Elena curated.When: 1988-1994 Where: Sagunto, Valencia, Spain.