In a normal regression analysis, one must either assume that participants or the particular choice of items add some randomness to the experiment, and either each participant's responses for all items must be averaged (treating participants as a random factor), or all participant's responses for each item is averaged (treating items as a random factor).
the vocabulary of hidden states is described in Section 2.1 and the emission distribution in Section 2.2 A key feature of the co-reference component of our model (described below) is that syntactic analysis and co-reference resolution happen simultaneously.