  Mixtures of experts models provide a framework in which covariates may be
included in mixture models. This is achieved by modelling the parameters of the
mixture model as functions of the concomitant covariates. Given their mixture
model foundation, mixtures of experts models possess a diverse range of
analytic uses, from clustering observations to capturing parameter
heterogeneity in cross-sectional data. This chapter focuses on delineating the
mixture of experts modelling framework and demonstrates the utility and
flexibility of mixtures of experts models as an analytic tool.
