Validity or Valid may refer to: Science/mathematics/statistics: * Validity (logic), a property of a logical argument * Scientific: ** Internal validity, the validity of causal inferences within scientific studies, usually based on experiments ** External validity, the validity of generalized causal inferences in scientific studies, usually based on experiments ** Valid name (zoology), in animal taxonomy ** Validly published name, in plant taxonomy * Validity (statistics), the application of the principles of statistics to arrive at valid conclusions ** Statistical conclusion validity, establishes the existence and strength of the co-variation between the cause and effect variables ** Test validity, validity in educational and psychological testing ** Face validity, the property of a test intended to measure something *** Construct validity, refers to whether a scale measures or correlates with the theorized psychological construct it measures *** Content validity, the extent to which a measure represents all facets of a given construct *** Concurrent validity, the extent to which a test correlates with another measure *** Predictive validity, the extent to which a score on a scale or test predicts scores on some other measure *** Discriminant validity, the degree to which results a test of one concept can be expected to differ from tests of other concepts that should not be correlated with this one *** Criterion validity, the extent to which a measure is related to an outcome *** Convergent validity, the degree to which multiple measures of the same construct lead to the same conclusion Other: *

Valid (number format) Unums (''universal numbers'') are a family of formats and arithmetic, similar to floating point, proposed by John L. Gustafson in 2015. They are designed as an alternative to the ubiquitous IEEE 754 floating-point standard. The latest version ...

, a universal number format (unum type III) *

Valid (engraving company) Valid is a Brazilian engraving company headquartered in Rio de Janeiro that provides security printing services to financial institutions, telecommunication companies, state governments, and public agencies in Brazil, Argentina, and Spain. In to ...

, a Brazilian company * VALID (Video Audio Line-up & IDentification), part of the GLITS broadcast television protocol * Validity and liceity (Catholic Church), concepts in the Catholic Church.

See also