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Dinesh Kumar, LPU Unit 10 : Item Analysis : Item Difficulty, Discrimination index, Effectiveness of Distractors

Unit 10 : Item Analysis : Item Difficulty, Notes

Discrimination index, Effectiveness of Distractors

CONTENTS
Objectives
Introduction
10.1 Meaning of Item Analysis
10.2 Need of Item Analysis
10.3 Process of Item Analysis
10.4 The Difficulty Index
10.5 Calculation of Difficulty Value of Items
10.6 Correcting Difficulty Indices for Chance Errors
10.7 Discrimination Index
10.8 Calculating Discriminating Value by Formula
10.9 Relationship between Difficulty Index and Discrimination Index
10.10 Effectiveness of Distractors
10.11 A Practical approach in Item Analysis

10.12 Summary
10.13 Keywords
10.14 Review Questions
10.15 Further Readings

Objectives

The objectives of this unit can be summarized as below :
• To discuss about the meaning of item analysis
• To describe about the need of item analysis
• To explain about the process of item analysis
• To describe about the Difficulty index and Calculation of difficulty value of items
• To explain about correcting difficulty indices for chance errors.
• To describe about the discrimination index and calculating discrimination value by formula
• To explain about the relationship between difficulty index and discrimination Index
• To discuss about the effectiveness of distractors

Introduction

After having administered a test and marked it, most teachers would discuss the answers with
students. Discussion would usually focus on the right answers and the common errors made by
students. Some teachers may focus on the questions most students performed poorly and the
questions students did very well. However, there is much more information available about a
test that is often ignored by teachers. This information will only be available if the Item Analysis

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