Negative and Positive Association Rules Mining from Text Using Frequent and Infrequent Itemsets

Table 1

IDF scores of sample keywords of the corpus.

Selected keywords	IDF	Discarded keywords	IDF
Chemo	2.2693	Threat	0.0158
Radiation	2.2535	Disease	0.0157
Tumor	2.2316	Severe	0.01426
Surgery	2.2135	Produce	0.01392
Cancer	2.2013	Result	0.01194
Temodar	1.9830	Need	0.00639
CT scan	1.9812	Analysis	0.00136
Glioblastoma	1.9609	Type	0.00940
Skull	1.8906	New	0.00843
Cause	1.8902	Level	0.00694
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