The Properties of a Psychological Assessment Measure

PSYCHOLOGICAL ASSESSMENT

PYC4807 / PSY4988

ASSIGNMENT 02:

DUE DATE: 9 JULY 2012

UNA DU TOIT

STUDENT NO: 31295525

CONTENTS

Page

1 INTRODUCTION……………………………………………………………………………………… 1

2 PLANNING PHASE…………………………………………………………………………………… 1

* 2.1 Specifying the aim of the measure……………………………………………………………….. 1

* 2.2 Defining the content of the measure…………….……………………………………………….. 2

* 2.3 Developing the test plan ………………………………………………………………………… 3

3 ITEM WRITING……………………………………………………………………………………….. 4

* 3.1 Writing the items…………………………………………………………………………………… 4

* 3.2 Reviewing the items……………………………………………………………………………….. 5

4 ASSEMBLING AND PRE-TESTING THE EXPERIMENTAL VERSION OF THE MEASURE… 6

4.1 Arranging the items…………………………………………….………………………………… 6

4.2 Finalising the length…………………………………………………….………………………… 6

4.3 Answer protocols………………………………………………………………………………….. 6

4.4 Developing administration instructions…………………………………………………………. 6

4.5 Pre-testing the experimental version of the measure…………………………………………. 6

4 ITEM ANALYSIS PHASE…………………………………………………………………………….. 7

5.6 Determining item difficulty (p)…………………………………………………………………… 7

5.7 Determining discriminating power……………………………………………………………… 8

5.8 Item response theory………………….…………………………………............................... 9

5.9 Criteria used for item selection ………………………………………………………………… 10

5 REVISING AND STANDARDISING THE FINAL VERSION OF THE MEASURE…………….. 10

6 TECHNICAL EVALUATION AND ESTABLISHING NORMS…………………………………….. 10

7.10 Establishing Reliability…………..……………………………………………….……………… 10

7.11.1 The concept of Reliability ……………………………………………………………… 10

7.11.2 Types of Reliability …………………………………...………………………………… 12

7.11.3 Factors affecting Reliability ……………………………………………………….....…. 17

7.11.4 What is...