An Exponentiation Method for XML Element Retrieval

Table 5

Compare performing runs based on MAP with and without the score sharing.

Run	MAP	P@10	P@20	P@30
p16-BM25-EXPO	0.3479	0.4316	0.3645	0.3298
p16-TF-EXPO	0.2125	0.2500	0.2171	0.1930
p16-PHRASE-EXPO	0.1937	0.2342	0.1921	0.1675
p16-BM25-SS	0.0641	0.0737	0.0908	0.1061
p16-TF-SS	0.0641	0.0711	0.0882	0.1044
p16-PHRASE-SS	0.0606	0.0605	0.0829	0.1070
%	81.58	82.92	75.09	67.83

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