Many real-life applications consider nominal categorical predictor variables that have a hierarchical structure, e.g. economic activity data in Official Statistics. In this paper, we focus on linear regression models built the presence of type variables, and study consolidation their categories to better tradeoff between interpretability fit model data. We propose so-called Tree based Linear Re...

In behavioural and evolutionary ecology, there are often large phenotypic differences between individuals in, for example, body size or large variation in abiotic conditions such as temperature, between measurements. This often inevitable source of variation may mask any effect of experimental treatment as it can have a large impact on the dependent variable of interest. In such cases, conventi...