Introduction The model Results A hidden Markov model for clustering mixed linear and circular data with missing values Jan Bulla 1 , Francesco Lagona 2 , Antonello Maruotti 2 , and Marco Picone 3 1 LMNO Universitè de Caen Caen, France 2 DIPES University of Roma Tre Rome, Italy 3 Institute for Environmental Protection and Research Marine Service Rome, Italy 1 of 28 An HMM for clustering mixed linear and circular data