. Author manuscript; available in PMC: 2009 Jan 1.

Published in final edited form as: Artif Intell Med. 2007 Nov 28;42(1):13–35. doi: 10.1016/j.artmed.2007.10.001

Table 5.

Evaluation of SNoW and Stat De-id on recognizing people, locations, and organizations found in the random corpus. Note that these are the only entity types SNoW was built to recognize. Highest F-measures are in bold. The difference in PHI F-measures between SNoW and Stat De-id is not significant at α = 0.05. The difference in non-PHI F-measures is significant at the same α and marked as such with an *.

Method	Class	Precision	Recall	F-measure
Stat De-id	PHI	98.31%	96.62%	97.46%
SNoW	PHI	95.18%	97.63%	96.39%*
Stat De-id	Non-PHI	99.64%	99.82%	99.73%
SNoW	Non-PHI	99.75%	99.48%	99.61%*