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Table 2 Top 20 key words’ term frequency (TF)

From: Uncovering trend-based research insights on teaching and learning in big data

Rank

Word

Frequency (%)

In-Degree

Out-Degree

Rank

Word

Frequency (%)

In-Degree

Out-Degree

1

student

797 (7.11%)

144

141

11

practice

124 (1.11%)

20

12

2

study

333 (2.97%)

55

39

12

teaching

103 (0.92%)

18

20

3

learning

270 (2.41%)

33

52

13

result

102 (0.91%)

20

11

4

education

228 (2.04%)

34

28

14

finding

99 (0.88%)

14

13

5

research

203 (1.81%)

40

35

15

analysis

98 (0.87%)

20

11

6

university

203 (1.81%)

33

29

16

approach

94 (0.84%)

6

12

7

experience

132 (1.18%)

12

14

17

process

83 (0.74%)

10

11

8

course

128 (1.14%)

21

20

18

teacher

83 (0.74%)

12

12

9

group

127 (1.13%)

20

19

19

development

81 (0.72%)

8

15

10

paper

126 (1.12%)

21

8

20

engagement

80 (0.71%)

9

14