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content validity ratio

Robert M. Guion


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content validity was introduced in an era when validity was mainly associated with validity coefficients in employment testing. Lawshe (1975) provided a quantitative index for assessing content validity, termed a content validity ratio (CVR), for individual test items. To compute it, job experts independently judge the item as measuring content that is essential, useful, or not necessary for job performance . With N judges, of whom n e have judged the knowledge required for the item to be essential, CVR = ( n e − N /2)/( N /2). Items with low or negative CVRs can be deleted; the mean CVR of items retained is the “content validity index” for the total test. ( 1975 ). A quantitative approach to content validity . Personnel Psychology , 28 , 563 – 75 . ... log in or subscribe to read full text

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