<b>dalmatian</b>: A Package for Fitting Double Hierarchical Linear Models in <i>R</i> via <b>JAGS</b> and <b>nimble</b>

Traditional regression models, including generalized linear mixed focus on understanding the deterministic factors that affect mean of a response variable. Many biological studies seek to understand non-deterministic patterns in variance or dispersion phenotypic ecological We describe new R package, dalmatian, provides methods for fitting double hierarchical models incorporating fixed and random predictors both variance. Models are fit via Markov chain Monte Carlo sampling implemented either JAGS nimble package simple functions monitoring sampler summarizing results. illustrate these through an application data food delivery by breeding pied flycatchers (Ficedula hypoleuca). Our intent is this makes it easier practitioners implement without having learn intricacies methods.