External validity
External Validity
External validity (/ɪkˈstɜːrnəl vəˈlɪdɪti/) is a term used in research design to refer to the degree to which the results of a study can be generalized to other situations, individuals, settings, and times. It is one of the two types of validity used to evaluate the validity of a research study, the other being internal validity.
Etymology
The term "external validity" is derived from the Latin words "externus" meaning "outside" and "validus" meaning "strong". It was first used in the context of psychology and social science research in the mid-20th century.
Related Terms
- Internal Validity: Refers to the degree to which a study's results are due to the variables that were manipulated, measured, or selected rather than other factors not systematically treated.
- Reliability: The consistency of a measure. A test is considered reliable if we get the same result repeatedly.
- Generalizability: The extent to which research findings and conclusions from a study conducted on a sample population can be applied to the population at large.
- Research Design: A detailed, planned framework for conducting scientific experiments, investigations, surveys and studies.
- Sampling Bias: A bias in which a sample is collected in such a way that some members of the intended population have a lower or higher sampling probability than others.
See Also
External links
- Medical encyclopedia article on External validity
- Wikipedia's article - External validity
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