Table 1

Overall comparison between the bm25 and pmra models.

Run

Model

Description

P5

vs. bm25^b

bm25*

bm25^b

bm25 (k₁ = 1.2, b = 0.75)

bm25, default parameters

0.381

-0.5%°

bm25*

bm25 (k₁ = 1.9, b = 1.00)

bm25, optimal parameters

0.383

+0.5%°

pmra*

pmra (λ = 0.022, μ = 0.013)

pmra, optimal parameters

0.399

+4.7% **

+4.2% **

Table shows model parameters, P5 values over the entire test collection, and relative differences.

Lin and Wilbur BMC Bioinformatics 2007 8:423   doi:10.1186/1471-2105-8-423