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), a universal number format (unum type III) * Valid (engraving company), a Brazilian company * GLITS, VALID (Video Audio Line-up & IDentification), part of the GLITS broadcast television protocol *Validity and liceity (Catholic Church), concepts in the Catholic Church.

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