The difficulty index and the discrimination index of a question

Calculation of the difficulty index of a question

Difficulty index                       Index for measuring the easiness or difficulty of a test question. It is the percentage (%) of students who have correctly answered a test question j it would be more logical to call it the easiness index. It can vary from 0 to 100%.

Steps in item analysis for MCQ Questions (relative criteria tests)

Steps in item analysis for MCQ Questions (relative criteria tests)

1. Award of a score to each student

2. Ranking in order of merit

3. Identification of groups: high and low

4. Calculation of the difficulty index of a question

5. Calculation of the discrimination index of a question

6. Critical evaluation of each question enabling a given question to be retained, revised or rejected