High-stakes decisions need highly reliable information. Results are compared and correlated with the initial test to give a measure of stability. An assessment that has very low reliability will also have low validity; clearly a measurement with very poor accuracy or consistency is unlikely to be fit for its purpose. To better understand this relationship, let's step out of the world of testing and onto a bathroom scale. Validity is measured through a coefficient, with high validity closer to 1 and low validity closer to 0. The reliability and validity of a measure is not established by any single study but by the pattern of results across multiple studies. Presentations. Measurement Reliability and Validity - Measurement Reliability and Validity | PowerPoint PPT presentation | free to view . Validity tells you how accurately a method measures something. The use of portfolio is critiqued based on both validity and reliability of the assessment instrument, and also on conformity with the concept of formative assessment. To learn more about validity, see my earlier post Actions . STABILITY RELIABILITY
Stability reliability (sometimes called test, re-test reliability) is the agreement of measuring instruments over time. … Some Factors that Affect the Validity of a Test 1. RELIABILITY RELIABILITY Validity is used to determine whether research measures what it intended to measure and to approximate the truthfulness of the results. You design a questionnaire to measure self-esteem. This indicates that the assessment checklist has low inter-rater reliability (for example, because the criteria are too subjective). Module 3: Reliability (screen 2 of 4) Reliability and Validity. 6: Reliability And Validity In Measurement And Research PPT. Even when a test is reliable, it may not be valid. Understanding Validity and Reliability in Classroom, School-Wide, or District-Wide Assessments to be used in Teacher/Principal Evaluations Warren Shillingburg, PhD January 2016 Introduction As expectations have risen and requirements for student growth expectations have increased across the country, more and more school districts are being asked to develop local assessments and to use … Validity and Reliability in Medical Education Assessment: Current Concepts Congreso Nacional De Educacion Medica Puebla, Mexico 12 January, 2007 Steven M. Downing, PhD Department of Medical Education University of Illinois at Chicago sdowning@uic.edu. VALIDITY • the degree to which a test actually measures what it tries to measure. Thus, tests should aim to be reliable, or to get as close to that true score as possible. Remove this presentation Flag as Inappropriate I Don't Like This I like this Remember as a Favorite. Presentation Summary : Statistical Conclusion Validity: Are the statistical conclusions well-grounded? PPT – Construct Validity and Reliability PowerPoint presentation | free to view - id: 1dfefe-ZDc1Z. Reliability is important in the design of assessments because no assessment is truly perfect. VALIDITY Validity is an indication of how sound your research is. Ch. Using pressure algometers, novice raters demonstrated substantial reliability in PPT assessment in healthy and pathological populations (Walton et al., 2011). 3. What do these numbers mean? Practice: Ask several friends to complete the Rosenberg Self-Esteem Scale. The results of this study showed a good-excellent criterion validity between PPT measured with a digital algometer as compared to HHD and the inter and intra-rater reliability of HHD to assess PPT was excellent. View Validity and Reliability Slides class.ppt from ME MISC at University of Texas, San Antonio. 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