PPT-Validity and Reliability

A Cheat Sheet Power Point What does it mean Validity Depends on the PURPOSE reaching a conclusion Must be inferred from evidence What you learn from it Reliability The . 0 RELIABILITY ALLOCATION Reliability Allocation deals with the setting of reliability goals for individual subsystems such that a specified reliability goal is met and the hardware and software subsystem goals are well b Is the Test Appropriate, Useful, and Meaningful?. Properties of Validity. Does the test measure what it purports to measure?. Validity is a property of inferences that can be made.. Validity should be established over multiple inferences.. Measuring Research Variables. Research Methods in Physical Activity. Research Methods in Physical Activity. Validity. Validity (. Degree to which a test or instrument measures what it purports to measure; can be categorized as logical, content, criterion, or construct validity. . Reliability gets more attention:. Easier to understand. Easier to measure. More formulas (like stats!). Base for validity. Need for validity. Does test measure what it claims?. Can test be used to make decisions?. It’s my favourite part of the syllabus…honest. Would a teacher lie to you?. I can reliably predict that you’re all yawning already. Y. Right, own up. Who wrote that? Detention for a week! Yes, we know it seems boring.... Validity . Is the translation from concept to . operationalization. accurately representing the underlying concept. . Does your variables measure what you think in abstract concepts.. This is more familiarly called Construct Validity.. . of. . diagnosis. DSM. The . D. iagnostic and . S. tatistical . M. anual of Mental Disorder (Edition 4), was last published in 1994. . The DSM is produced by the American Psychiatric Association. . & . Validity. Reference. The majority of this lecture was taken . from . How . to Measure Survey Reliability . & Validity. . by Mark . Litwin. , Sage Publications,1995. .. Lecture objectives. Why is this so important and. why is this so difficult?. Reliability and Validity. The language for this is from the quantitative tradition—scientific . verification—positivism. . Habermas. ’ cognitive interest of . Jill Hoxmeier. H615: Advanced Research Design. October 10, 2013. “Boy, a few more like that and I’ll be ready for Gamblers Anonymous”. Twin Problems of Construct Validity. Construct Validity: . Daren K. . Heyland, MD, MSc, FRCPC. Professor of Medicine. Queen’s University, Kingston General Hospital. Kingston, Ontario. A Randomized Trial of Supplemental . Parenteral. Nutrition . in Under . Jamie DeLeeuw, Ph.D.. 5/7/13. Reliability. Consistency of measurement. The measure itself is dependable.. ***A measure must be reliable to be valid!***. High reliability = greater consistency = lower randomness (error). Basics . What is reliability? . What is validity? . Can you have one without the other? Why or why not? . Reliability. Observed score . = True score random error systematic error. Explain. Why is this important? . Easier to understand. Easier to measure. More formulas (like stats!). Base for validity. Need for validity. Does test measure what it claims?. Can test be used to make decisions?. Validity. Reliability is a necessary, but not a sufficient condition for validity..