Term | Meaning |
Subject (S) | S is a subject/paper offered in different semesters of a course. |
Modules/Units | For each subject, there is a university pre- scribed syllabus which consists of different modules/units. |
Question Bank (QB) | QB is a database which stores module wise questions with its details such as question- no, question-content, question-type, question- marks and question-answer-time |
Q | Q is the total number of questions stored under a module |
ti | ti refers to the total number of questions in which term i appears |
f reqij | f reqij is the frequency of term i in question j |
maximum frequency (max freqij) | max freqij is the maximum frequency of a term in question j |
term frequency (tfij) | tfij refers to the importance of a term i in question j. It is calculated using the formula: tfij = freqij/max freqij |
Inverse Document Frequency (id fi) | id fi refers to the discriminating power of term i and is calculated as: id fi=log2 (Q/ti) |
tf-idf weighting (Wij) | It is a weighting scheme to determine weight of a term in a question. It is calculated using the formula: Wi j= tfij × id fi |
Question-Term-Set, Ti (question qi) | A set of terms extracted from each question by performing its tokenization, stop word removal, taxonomy verb removal and stemming |
Theshold, δ | User input threshold value to find the similarity |