표 2 국내 연구의 단어 순위

단어 순위						TF-IDF를 통한 단어 순위
	단어	빈도		단어	빈도		단어	TF-IDF		단어	TF-IDF
1	student	180	11	LMS	30	1	course	4.60	11	LMS	4.01
2	learning	126	12	group	30	2	achievement	4.52	12	group	4.01
3	data	63	13	character	29	3	activity	4.45	13	purpose	4.00
4	course	53	14	type	28	4	time	4.35	14	system	3.98
5	time	53	15	difference	26	5	model	4.24	15	design	3.93
6	log data	52	16	variable	26	6	variable	4.14	16	response	3.90
7	achievement	48	17	number	25	7	difference	4.12	17	environment	3.87
8	activity	43	18	behavior	24	8	character	4.11	18	number	3.87
9	system	37	19	design	24	9	semester	4.05	19	type	3.86
10	model	33	20	purpose	24	10	behavior	4.04	20	university	3.82