⊿ Point. {R} Glossary. ◢ Keyword: R. ◥ University. {q} PhD. {tr} Training. ⚫ UK. ↂ EndNote. ☝️ Weerakkody. Reliability. From Wikipedia, the free encyclopedia Reliability, reliable, or unreliable may refer to: Science, technology, and mathematics[edit] Computing[edit] Other uses in science, technology, and mathematics[edit] Other uses[edit] Reliabilism, in philosophy and epistemologyUnreliable narrator, whose credibility has been seriously compromised See also[edit] Topics referred to by the same term. Reliability (statistics) Overall consistency of a measure in statistics and psychometrics There are several general classes of reliability estimates: For example, if a set of weighing scales consistently measured the weight of an object as 500 grams over the true weight, then the scale would be very reliable, but it would not be valid (as the returned weight is not the true weight).
For the scale to be valid, it should return the true weight of an object. This example demonstrates that a perfectly reliable measure is not necessarily valid, but that a valid measure necessarily must be reliable. 1. Factors that contribute to consistency: stable characteristics of the individual or the attribute that one is trying to measure. 2. A true score is the replicable feature of the concept being measured. Errors of measurement are composed of both random error and systematic error. This conceptual breakdown is typically represented by the simple equation: Observed test score = true score + errors of measurement 1. 2. 3. 1. 2.