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Table 4 Examples of four typical topics and their probabilities over words in the Data Structure course. These representative words, including topic words (not underlined) and emotion words (underlined) have higher probabilities. (+) denotes that the topic’s overall emotion is positive. The probability value below (+) represents the average probability of each topic appearing in the next semester of the course

From: Topic tracking model for analyzing student-generated posts in SPOC discussion forums

Course Topics Topic Label Words Prob. Words Prob.
Data Structure Topic 9 (+) (0.054) Application of data structure 结构/structure 0.0397 数据/data 0.0371
复杂/complicated 0.0122 设计/design 0.0106
程序/program 0.0101 人才/talents 0.0090
信息/information 0.0080 培养/cultivate 0.0080
正确/right 0.0042 不清楚/unclear 0.0011
Topic 14 (+) (0.051) Programming implementation 串/string 0.0943 位置/index 0.0615
理解/understand 0.0267 语句/statement 0.0143
循环/loop 0.0123 输出/printf 0.0123
代码/code 0.0123 错/wrong 0.0102
掌握/master 0.0080 容易/easy 0.0101
Topic 16 (+) (0.070) Method of data query 树/tree 0.0293 表/list 0.0235
链/chain 0.0141 查找/search 0.0141
排序/sort 0.0118 遍历/traverse 0.0106
路径/path 0.0010 插入/insert 0.0094
理解/understand 0.0059 冲突/conflict 0.0047
Topic 17 (+) (0.054) Method of data storage 指针/pointer 0.0212 树/tree 0.0151
表/list 0.0151 链/chain 0.0141
结构/structure 0.0131 元素/code 0.0123
队/queue 0.0081 存储/store 0.0081
错误/error 0.0051 确定/confirm 0.0020