This accessible book outlines the key ingredients of psychological assessment and provides case studies to illustrate their application, making this an ideal textbook for courses on psychometrics or psychological assessment. The book covers the nature of assessment, basic components, how tests are made, underlying statistics, reliability and validity, assessment of intelligence, abilities and personality, non-psychometric approaches, as well as ethical and professional issues and modern developments. A final chapter explains how readers can construct their own tests. Wide-ranging case studies demonstrate the variety of contexts in which assessment is conducted. The author’s clarity of writing and use of practical examples throughout helps students apply these methods in practice with confidence as part of their studies on an array of courses.

The Importance of Reliability

The importance of reliability

Learning Objectives

By the end of this chapter you should be able to:

  • Understand the significance of reliability and the basic principles of correlation.
  • Describe how test error arises, the different kinds of reliability coefficient and generalizability theory.
  • Calculate Standard Error and determine confidence intervals around test scores.
  • Evaluate differences between scores using the Standard Error of difference.

What is This Chapter about?

Having survived the statistics, understanding correlation is now an essential prerequisite for getting to grips with the key attributes of psychological measures, so we begin with what it means and its mathematical foundations. We then move on to identifying how test error arises and the different types of reliability coefficients. Afterwards we fall into the deep well of the Standard Error of ...

  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles