Wednesday, June 5, 2019

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



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