An Exponentiation Method for XML Element Retrieval

Table 4

Compare performing runs based on MAP with and without the exponentiation.

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	0.1830	0.2184	0.1974	0.1939
p16-TF	0.0857	0.1447	0.1118	0.0921
p16-PHRASE	0.0857	0.1447	0.1118	0.0921
%	52.60	50.60	54.16	58.79

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