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What is the difference between reliability and validity?

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Reliability and Validity. In order for research data to be of value and of use, they must be both reliable and valid. Reliability ... IQ tests should not give different results over time (as intelligence is assumed to be a stable characteristic). Validity. Validity refers to ... It should also apply to people beyond the sample in the study. read more

Reliability vs validity. Reliability and validity seem to be synonymous, but they do not mean the same thing. They are actually different things, different terms when they are explained in a technical manner. These terms are often used on scholastic outputs such as thesis studies, term papers, research papers, and the likes. read more

Relationship between reliability and validity If data are valid, they must be reliable. If people receive very different scores on a test every time they take it, the test is not likely to predict anything. read more

In an experiment, reliability signals how consistently the experiment produces the same results while validity signals whether the experiment measures what it is intended to measure. An experiment's reliability does not offer any information about its validity. read more

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