An Exponentiation Method for XML Element Retrieval

Table 6

The significance (𝑃) is computed with a 2-tailed 𝑡-test at MAP.

	Run	MAP
BM25	p16-BM25-EXPO	0.3479
	p16-BM25	0.1830
	𝑃 (𝑡-test)	0.48
Score Sharing	p16-BM25-EXPO	0.3479
	p16-BM25-SS	0.0641
	𝑃 (𝑡-test)	0.75

The bold font refer to the % that use to calculate value of improvement.