표 3 국외 연구의 단어 순위

단어 순위						TF-IDF를 통한 단어 순위
	단어	빈도		단어	빈도		단어	TF-IDF		단어	TF-IDF
1	student	67	11	model	16	1	pattern	1.95	11	problem-solving	1.81
2	log data	27	12	transition	14	2	group	1.95	12	feature	1.78
3	performance	25	13	behavior	13	3	process data	1.92	13	task	1.78
4	process	24	14	difference	13	4	log data	1.92	14	interaction	1.78
5	learning	20	15	problem-solving	13	5	performance	1.89	15	transition	1.77
6	pattern	20	16	IBL	12	6	model	1.88	16	information	1.77
7	group	19	17	feature	12	7	course	1.83	17	activity	1.76
8	data	18	18	interaction	12	8	learning	1.83	18	assessment	1.75
9	process data	18	19	task	12	9	behavior	1.81	19	classification	1.74
10	course	16	20	LMS	11	10	difference	1.81	20	data	1.71