PubMed related articles: a probabilistic topic-based model for content similarity

Table 3 Relative differences between the bm25 and pmra models.

Template	bm25* vs. bm25^b	pmra* vs. bm25^b	pmra* vs. bm25*
#1: methods or protocols	-0.5%°	+20.0% **	+20.5% **
#2: role of gene in disease	+0.6%°	+3.1% *	+2.5% *
#3: role of gene in biological process	+4.0% **	-0.6%°	-4.4% **
#4: gene interactions in organ/disease	-5.4%°	+2.0%°	+7.8%°
#5: mutation of gene and its impact	-0.5%°	+5.0% *	+5.5% **

Three conditions are compared: bm25^b (default parameters), bm25* (optimized parameters), and pmra* (optimized parameters). Each column represents a x vs. y comparison, where the figures indicate the relative improvements of x over y. In general, we see that the differences between optimized and default bm25 are not statistically significant, whereas the differences between pmra and bm25 are.

ISSN: 1471-2105