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Encyclopedia of Measurement and Statistics

Neil J. Salkind & Kristin Rasmussen

Pub. date: 2007 | DOI: http://dx.doi.org/10.4135/9781412952644

Print ISBN: 9781412916110 | Online ISBN: 9781412952644

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Encyclopedia Entry

Validity Coefficient

Shawn T. Bubany

The validity coefficient is a statistical index used to report evidence of validity for intended interpretations of test scores and defined as the magnitude of the correlation between test scores and a criterion variable (i.e., a measure representing a theoretical component of the intended meaning of the test). For example, the relationship between Scholastic Aptitude Test scores and college grade point average (GPA) as the criterion variable may demonstrate validity evidence for interpreting Scholastic Aptitude Test scores as an indication of academic success (intended meaning) in terms of achieving high grades (theoretical component). According to the 1999 edition of the Standards for Educational and Psychological Testing , the term validity refers to the extent to which an intended interpretation of test scores is supported by evidence. Rather than discussing validity in terms of differing types (e.g., construct, content, and criterion-related validity), the 1999 standards view construct validity as the Correlational ...

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