Apollo is a very flexible R package for the estimation and application of choice models.

Apollo users can write their own model functions or mix predefined ones.

Features include:

Support for random heterogeneity (continuous and discrete, at individual and observation levels)
Standalone and hybrid model structures
Classical and Bayesian estimation
Multiple discrete continuous models
Analytical gradients for all models, for fast estimation
Multi-threaded estimation
Extensive set of pre- and post-estimation routines

Apollo is a completely free package which does not rely on commercial statistical software as a host environment. It relies on R, which is very widely used across disciplines and works well across different operating systems.

Apollo is used around the world, in academia and consulting, and has been used in a wide range of applications, from transport to marketing, and from health to environmental economics.

Join us now and start using Apollo, the most flexible choice modelling software (up to a probability)!