The Principles Of Reliability And Validity Essay

928 WordsOct 20, 20144 Pages
Introduction If you are looking for scientific proof, then validity and reliability are what you need. In the work by Xie, & Huang (2014) they describe the following: The principles of reliability and validity are fundamental cornerstones of the scientific method. Reliability is defined as the extent to which a measure is repeated under ideal conditions. Validity refers to the degree to which a test measures what it purports to measure. Establishing good quality studies need both high reliability and high validity. (p.326). Both of these concepts are worthy of exploration, and understanding them is crucial for evaluating, designing, and performing scientific studies. Reliability Reliability is about consistency. For data to have reliability, it will need stability, internal reliability, and inter-observer reliability. Stability. If a measure does not fluctuate over time, it is considered to have stability. Data collected at one period of time and then collected again at a different period in time will not have a great deal of variability. Stability can be tested by administering a test at one point in time and then re-administering the same test under the same conditions. Internal Reliability Internal reliability. This refers to the scale that is used to measure data. If the scale is consistent, then it is said to have internal reliability. We need to be sure that whatever variation we are measuring is actually produced by the variables, not by the
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