Table 3. SRDP and the number of unexpected items included in the 12 strategies.

The values are ordered by SRDP. M and SD denote mean and standard deviation, respectively.

	Strategy			SRDP	|UE|
	Text mining method	Profiling source	Ranking method	M (SD)	M (SD)
1.	TF-IDF	Own papers	IA-Select	0.45 (0.38)	2.95 (1.05)
2.	CF-IDF	Twitter	CosSim	0.39 (0.31)	4.91 (0.29)
3.	TF-IDF	Twitter	IA-Select	0.36 (0.29)	4.91 (0.43)
4.	CF-IDF	Twitter	IA-Select	0.31 (0.22)	4.95 (0.21)
5.	CF-IDF	Own papers	CosSim	0.26 (0.28)	4.91 (0.29)
6.	CF-IDF	Own papers	IA-Select	0.25 (0.28)	4.91 (0.29)
7.	HCF-IDF	Own papers	IA-Select	0.24 (0.22)	4.95 (0.21)
8.	HCF-IDF	Twitter	CosSim	0.22 (0.28)	5.00 (0.00)
9.	TF-IDF	Twitter	CosSim	0.20 (0.24)	4.95 (0.21)
10.	HCF-IDF	Twitter	IA-Select	0.18 (0.21)	5.00 (0.00)
11.	HCF-IDF	Own papers	CosSim	0.16 (0.18)	5.00 (0.00)
12.	TF-IDF	Own papers	CosSim	0.00 (0.00)	0.00 (0.00)