As in the previous work, System stime etime location speaker overall WHISK (Soderland, 1999) 92.6 86.1 66.6 18.3 65.9 SRV (Freitag, 1998) 98.5 77.9 72.7 56.3 76.4 HMM (Frietag & McCallum, 1999) 98.5 62.1 78.6 76.6 78.9 RAPIER (Califf & Mooney, 1999) Peshkin and Pfeffer (2003).)
in the above w t is the word at position t, T t is the POS tag at position t, w ranges over all words in the training data, and T ranges over all Penn Treebank part-of-speech tags.