... param-eters associated with an event z, φ a notation forall model parameters, and X a notation for all ran-dom variables that represent observable features.2Given a document collection annotated ... dia of Philosophy (Fall 2009Edition), Edward N. Zalta (ed.), http://plato.stanford.edu/archives/fall2009/entries/davidson/.Srini Narayanan and Sanda Harabagiu. 2004. Ques-tion Answering Based ... vari-ous applications such as topic detection and track-ing (Allan et al., 1998), information extraction(Humphreys et al., 1997), question answering(Narayanan and Harabagiu, 2004), textual...