Lexical adaptation of link grammar to the biomedical sublanguage: a comparative evaluation of three approaches

BMC Bioinformatics

Table 4 Performance for single extensions

	Orig	UMLS	Δ	xMG	Δ	Brill	Δ	GT	Δ
All, first linkage	74.2	75.4	4.7	76.0	7.0	75.4	4.7	76.8	10.1
All, best linkage	82.7	83.5	4.6	84.5	10.4	83.7	5.8	85.3	15.0
NT, first linkage	78.0	78.1	0.5	78.9	4.1	78.0	0.0	79.4	6.4
NT, best linkage	87.4	86.9	-4.0	88.0	4.8	86.7	-5.6	88.3	7.1
p	N/A		p ≈ 0.06		p < 0.01		p ≈ 0.07		p < 0.01

First linkage denotes the linkage ordered first by the parser heuristics and best linkage the best performance achieved by any linkage returned by the parser. Results marked NT are for the subset of sentences where no timeouts occurred for any of the modifications. Δ columns give relative decrease in error with respect to the original LGP, and p values are for "All, first linkage" performance.

ISSN: 1471-2105