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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