Results of Boyce Index corresponding to Pearson correlation values between predicted probabilities of event occurrence and the frequency of event observation records of the imago stage of the Geranium bronze butterfly (a), medusae of the freshwater jellyfish (b), the flowering of floating primrose-willow (c) and the garden lupine (d). The boxplots represent the variation of correlation values assessed for 7 years (2016 to 2022), using three modelling algorithms (boosted regression trees, BRT; generalised linear models with lasso regularisation, GLM-Lasso; random forest, RF) and an ensemble of previous algorithms (Ensemble), trained with observation data corrected for spatial bias.