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Understanding Measurement Reliability, Bias, and Validity in Research

Explore the concepts of reliability, bias, and validity in research, understanding their significance and differences, and learn strategies to enhance the quality of measurements.

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Understanding Measurement Reliability, Bias, and Validity in Research

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Presentation Transcript

  1. Stat 135 Lab 5 Learning Objective #26 TA: Dongmei Li

  2. A one sentence definition for each of the three words • Reliability • The variability in measurements • Bias • Consistent error in one direction • Validity • Addressing the right issue

  3. Lab 5 Learning Objective • 26. The reliability of a measurement is seen in the variability of independently repeated measurements.

  4. Some other important points • 21. The question of validity must always be addressed – it's often difficult to measure the variable of interest. • 22. Measurements will vary when repeated. • 23. The average of several measurements is less variable than a single measurement. • 24. Understand the difference between validity, reliability, and bias in a measurement situation. • 25. To improve bias, the experimenter must improve the measuring instrument. • 27. Repeated measurements can not help you judge the level of bias – for that you need an external standard.

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