English: This diagram summarizes the structure of a phylodynamic analysis as a hierarchical Bayesian model. Rectangular nodes represent data sources (sequence alignment, sample collection times), and nodes with rounded corners represent parameter estimates (fitted models) that can in turn be used as data inputs for a subsequent model. Each arrow represents a model inference step that generates samples from the posterior distribution defined by the data and the model. The model associated with each step is represented by a circular node; each model comprises a number of prior beliefs. This schematic displays multiple model nodes to emphasize the existence of other models with different assumptions and prior beliefs that are not necessarily evaluated on the data.