Reliability and Validility

Good Essays
Reliability and Validity
Ebony Johnson
University of Phoenix

Reliability has to do with the quality of measurement and is the consistency of repeatability of measures. To define it precisely researchers first have to learn about the foundation of reliability- the true score theory of measurement. Then researchers need to understand the different types of measurement error because they play a key role in degrading reliability. Because reliability can only be estimated there are different types of reliability that has multiple ways to estimate reliability for that type. In the end it is important to integrate the idea of reliability with the other major criteria for the quality of measurement, validity. Validity refers to the degree to which a study accurately reflects or assesses the specific concept the researcher is attempting to measure. Validity is concerned with the study's success at measuring what the researchers set out to measure.
Reliability is defined as a criterion used to define the consistency, stability, and dependability of how all the information is suited for the purpose intended. For example, when researchers look at human services and human service management reliability can be used to measure the behaviors associated with parenting skills, job performance or mental health status. There are five types of reliability alternate form reliability is the degree of relatedness of different forms of the same test. Then there is internal-consistency reliability, which is the degree of relatedness of items in a test or all raters in a judgment study. Judge-to-judge reliability is the reliability of any single item on average. Finally, test-retest reliability which is the degree of temporal stability of a measuring instrument or test, or the characteristic it is designed to evaluate from one administration to another.

Validity is a measure used to show how well the measure or design does what it states that it is going to do. For example,

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Reliability

    • 338 Words
    • 4 Pages

    Reliability It means the extent to which a test is consistent and dependable. It is concerned with the consistency of responses from moment to moment. However, it may not always be valid. Techniques in Testing the Reliability of Assessment Methods or RAM I. Test-retest Method The same test is administered twice to the same group of student and the correlation coefficient is determined. Disadvantages: 1. When the time interval is short, the respondents may recall their previous responses resulting…

    • 338 Words
    • 4 Pages
    Satisfactory Essays
  • Good Essays

    Reliability

    • 875 Words
    • 14 Pages

    Reliability in the design context Weibull Analysis • • • • Practical testing Trends Beta trends Real data for numerical work • Weibull examples Failure rate Early-life failure Wear out Mid-life failure Time in service Failure rate Falling values suggesting initial defects x Rising values suggesting wearing out o x o x x Time in service o o o Failure rate β>1 Β<1 β=1 Time in service Failure modes and effects analysis System/equipment: Analyst: Dwg no,: Date:…

    • 875 Words
    • 14 Pages
    Good Essays
  • Good Essays

    Reliability

    • 4772 Words
    • 20 Pages

    Software Reliability, Modeling and Uncertainty – An Independent Study Software Reliability, Reliability Models & Uncertainty Principles - An Independent Study SUBMITTED BY: Bhavya Jain [09ITMG1020CSE ] DEPARTMENT OF CSE & IT ITM UNIVERSITY, GURGAON, FORMLY KNOWN AS INSTITUTE FOR TECHNOLOGY & MANAGEMENT (AUTONOMOUS UNDER MDU, ROHTAK) Bhavya Jain [09ITMG1020CSE] Page 1 Software Reliability, Modeling and Uncertainty – An Independent Study CERTIFICATE It is to certify that the work…

    • 4772 Words
    • 20 Pages
    Good Essays
  • Good Essays

    Reliability

    • 514 Words
    • 2 Pages

    EXPLORING RELIABILITY AND VALIDITY INSTRUCTIONS In a 2–3-page Word document (not including the title and reference page), you will analyze the psychometrics provided from the Values and Motives Questionnaire (VMQ). Use APA formatting for the font (Times New Roman 12 pt.), title page, margins, and section headings. To receive full credit for this assignment, be sure to: 1. Address the type of reliability and validity used. Explain the types of reliability and validity used. The authors of the…

    • 514 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Reliability

    • 327 Words
    • 2 Pages

    a C. Reliability In order for assessments to be sound, they must be free of bias and distortion. Reliability and validity are two concepts that are important for defining and measuring bias and distortion. Reliability refers to the extent to which assessments are consistent. Just as we enjoy having reliable cars (cars that start every time we need them), we strive to have reliable, consistent instruments to measure student achievement. Another way to think of reliability is to imagine a kitchen…

    • 327 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Reliability

    • 686 Words
    • 3 Pages

    Exam-type questions on Thrust Bearing design 1. You have been asked to design a minimum power-loss, uni-directional, thrust bearing for an horizontally-mounted, axial, ammonia compressor in a nitric acid plant. The compressor has a shaft diameter of 100 mm and generates a thrust of 15kN when operating at 6,000 rpm. The thrust is negligible at zero speed. a. What type of thrust bearing would you recommend and why? b. What are the physical reasons why a dry, PTFE bearing would…

    • 686 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Reliability and Validity

    • 1000 Words
    • 4 Pages

    Reliability and validity are essential in terms of observation and measurement as it relates to human services research. In order to ensure this particular research has legitimacy it is vital that testing and research is consistent and specific. This paper will define and describe the types of reliability and validity and provide examples of each as it relates to human services research. It will also provide examples of how data collection methods and instruments are used in relation to human services…

    • 1000 Words
    • 4 Pages
    Powerful Essays
  • Good Essays

    Reliability Exercise

    • 631 Words
    • 3 Pages

    problems is a stable characteristic, as it is largely genetically determined (Nairne, 2009). Test-retest is typically appropriate for measures with stable attributes, but this test’s novel nature makes it an inappropriate technique in regard to reliability. In effect, its novelty diminishes after the initial testing, producing difficulties due to practice effects, reactivity, or both. Since it has just 20 questions, furthermore, it is easier for examinees to remember a significant portion of its items…

    • 631 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Reliability Validity

    • 2617 Words
    • 8 Pages

    Written Reflection on Reliability and Validity July 24, 2014 Written Reflection on Reliability and Validity Educational and psychological testing assessments are one of the most important roles therapists have. The correct use and understanding of tests can provide aid, benefit, and change the life of examinees. However, incorrect use of instrument tools and lack of knowledge pertaining to test development, interpretation and improper use of tools can also damage lives. As counselors, we must…

    • 2617 Words
    • 8 Pages
    Better Essays
  • Better Essays

    exploring reliabilities

    • 1207 Words
    • 5 Pages

    Exploring Reliability and Validity Researchers have constructed instruments in attempt to empirically measure values and culture belief systems of people and societies. In order for one to measure what some may consider subjective meanings; concrete definitions were given to the types of values that were examined in the “Values and Motives Questionnaire” (Values and Motives Questionnaire, n.d., p.1). The values examined were categorized as interpersonal, extrinsic, and intrinsic values (Values and…

    • 1207 Words
    • 5 Pages
    Better Essays