Sunday, July 26, 2015

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%.

Saturday, July 25, 2015

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