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Types of Reliability

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❶When designing an assessment of learning in the theatre department, it would not be sufficient to only cover issues related to acting. Two major ways in which inter-rater reliability is used are a testing how similarly people categorize items, and b how similarly people score items.

Split-half method

Experimental Research Methods
Inter-Rater or Inter-Observer Reliability
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The new measure could be correlated with a standardized measure of ability in this discipline, such as an ETS field test or the GRE subject test. The higher the correlation between the established measure and new measure, the more faith stakeholders can have in the new assessment tool. If the measure can provide information that students are lacking knowledge in a certain area, for instance the Civil Rights Movement, then that assessment tool is providing meaningful information that can be used to improve the course or program requirements.

Sampling Validity similar to content validity ensures that the measure covers the broad range of areas within the concept under study. Not everything can be covered, so items need to be sampled from all of the domains. When designing an assessment of learning in the theatre department, it would not be sufficient to only cover issues related to acting. Other areas of theatre such as lighting, sound, functions of stage managers should all be included. The assessment should reflect the content area in its entirety.

National Council on Measurement in Education. Standards for educational and psychological testing. Methods in Behavioral Research 7 th ed. American Council on Education. Want the full version to study at home, take to school or just scribble on? Whether you are an academic novice, or you simply want to brush up your skills, this book will take your academic writing skills to the next level. Don't have time for it all now? No problem, save it as a course and come back to it later.

Share this page on your website: How to Choose the most Appropriate Design? This article is a part of the guide: Select from one of the other courses available: Don't miss these related articles:. Check out our quiz-page with tests about: Back to Overview "Scientific Method". Search over articles on psychology, science, and experiments. Leave this field blank: Want to stay up to date? Get all these articles in 1 guide Want the full version to study at home, take to school or just scribble on?

Get PDF Download electronic versions: Save this course for later Don't have time for it all now? Add to my courses. Take it with you wherever you go. The Research Council of Norway. A perfectly reliable result would be that they both classify the same pictures in the same way. Observers being used in assessing prisoner stress are asked to assess several 'dummy' people who are briefed to respond in a programmed and consistent way.

The variation in results from a standard gives a measure of their reliability. In a test scenario, an IQ test applied to several people with a true score of should result in a score of for everyone. In practice, there will be usually be some variation between people.

Reliability can vary with the many factors that affect how a person responds to the test, including their mood, interruptions, time of day, etc. A good test will largely cope with such factors and give relatively little variation. An unreliable test is highly sensitive to such factors and will give widely varying results, even if the person re-takes the same test half an hour later.

Generally speaking, the longer the delay between tests, the greater the likely variation. Better tests will give less retest variation with longer delays.

Of course the problem with test-retest is that people may have learned and that the second test is likely to give different results. This method is particularly used in experiments that use a no-treatment control group that is measure pre-test and post-test. Various questions for a personality test are tried out with a class of students over several years. This helps the researcher determine those questions and combinations that have better reliability.

In the development of national school tests, a class of children are given several tests that are intended to assess the same abilities. A week and a month later, they are given the same tests. With allowances for learning, the variation in the test and retest results are used to assess which tests have better test-retest reliability.

One problem with questions or assessments is knowing what questions are the best ones to ask. A way of discovering this is do two tests in parallel, using different questions.

Assessing Reliability

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Inter-rater reliability is one of the best ways to estimate reliability when your measure is an observation. However, it requires multiple raters or observers. As an alternative, you could look at the correlation of ratings of the same single .

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Inter-rater reliability. The test-retest method assesses the external consistency of a test. This refers to the degree to which different raters give consistent estimates of the same behavior. Inter-rater reliability can be used for interviews. Note, it can also be called inter-observer reliability when referring to observational Saul Mcleod.

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Validity encompasses the entire experimental concept and establishes whether the results obtained meet all of the requirements of the scientific research method. For example, there must have been randomization of the sample groups and appropriate care and diligence shown in the allocation of controls. Reliability is a measure of the consistency of a metric or a method. Every metric or method we use, including things like methods for uncovering usability problems in an interface and expert judgment, must be assessed for reliability. In fact, before you can establish validity, you need to establish.

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Research Methods in Psychology. Chapter 5: Psychological Measurement. Reliability and Validity of Measurement Learning Objectives. Define reliability, including the different types and how they are assessed. Define validity, including the different types and how they are assessed. Test Validity and Reliability Whenever a test or other measuring device is used as part of the data collection process, the validity and reliability of that AllPsych > Research Methods > Chapter Test Validity and Construct validity is the term given to a test that measures a construct accurately and there are different types of.