Table 5.

Scores of 18 unique terms selected by Chi-square and DFC for query 207 on 40 documents

Terms	P (relevance)	P (corpus)	${tdf}_r$	$\overline{{tdf}_{nr}}$	${tdf}_{nr}$	$\overline{{tdf}_r}$	CS	${Rank}_{CS}$	DFC	${Rank}_{DFC}$
etidronate	0.0019	3.10E-07	40	162186	33	0	11.64	1	88891	1
fetuin	0.0029	1.70E-06	4	161944	275	36	4.941	2	225.14	16
bisphosphonates	0.0017	9.03E-07	32	161948	271	8	3.208	3	13674	3
incadronate	0.0003	5.90E-08	4	162214	5	36	1.525	4	7205.69	12
paget’s	0.0008	3.70E-07	6	162119	100	34	1.728	5	1366.93	15
pamidronate	0.0012	7.50E-07	18	162081	138	22	1.918	6	8399.17	11
aminobisphosphonates	0.0003	7.60E-08	6	162202	17	34	1.184	7	6339.73	13
ibandronate	0.0006	3.60E-07	12	162184	35	28	0.999	8	12411	6
bisphosphonate	0.0007	4.80E-07	26	162023	196	14	1.019	9	12320.1	7
tiludronate	0.0001	3.40E-08	5	162206	13	35	0.294	10	5626.01	14
alendronate	0.0005	6.40E-07	24	162096	123	16	0.39	12	15865.1	2
didronel	1.80E-05	5.50E-09	4	162218	1	36	0.059	16	12976.3	4
risedronate	0.0003	1.90E-07	12	162186	33	28	0.473	11	12963.5	5
art271	1.40E-05	2.08E-09	3	162219	0	37	0.098	14	12166.7	8
int1999; 9	1.40E-05	2.08E-09	3	162219	0	37	0.098	15	12166.7	9
pprice	3.20E-05	7.60E-09	4	162217	2	36	0.135	13	10812.3	10