FlexMix Version 2: Finite Mixtures with Concomitant Variables and Varying and Constant Parameters

This article is a (slightly) modified version of Grün and Leisch (2008b), published in the Journal of Statistical Software. flexmix provides infrastructure for flexible fitting of finite mixture models in R using the expectation-maximization (EM) algorithm or one of its variants. The functionality of the package was enhanced. Now concomitant variable models as well as varying and constant parameters for the component specific generalized linear regression models can be fitted. The application of the package is demonstrated on several examples, the implementation described and examples given to illustrate how new drivers for the component specific models and the concomitant variable models can be defined.