ITEM ANALYSIS

ITEM ANALYSIS AND VALIDATION

Benefits of Item Analysis

• It provides useful information for class discussion of the test
• It provides data which helps students improve their learning
• It provides insights and skills that lead to the preparation of better tests in the future

Item Difficulty

• the number of students who are able to answer the item correctly divided by the total number of students

Item Difficulty = number of students with correct answer/total number of students

Difficulty Index

Index of Discrimination

• tells whether it can discriminate between those who know and those who do not know the answer
• The difference between the proportion of the upper group who got an item right and the proportion of the lower group who got the item right

Index of Discrimination=DU - DL