A group of statistical techniques to model the way people choose between alternatives, for example, where to retire. Duncombe et al. (2001) Int. J. Pop. Geog. 7 offer a mathematical but clear exposition of the method, together with some software options.

http://www.rand.org/content/dam/rand/pubs/research_briefs/2007/RAND_RB9204.pdf A full explanation of choice modelling on pdf at Rand Europe’s website.