Three Types Of Validity And Evaluation Of Psychometric Property Evaluation

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Psychometric Property Evaluation There are two basic psychometric properties, validity and reliability that have been used to evaluate the quality of scale development. Psychometric testing used to evaluate the quality of instrument (Polit& Beck, 2010). 1. Validity Validity refers to ability of an instrument to measure the test scores appropriately, meaningfully, and usefully (Polit& Beck, 2010). The instrument has been developed to serve three major functions: (1) to represent a specific universe of content, (2) to represent measurement of specific psychological attributes, (3) to represent the establishing of a relationship with a particular criterion. There are three types of validity; each type represents a response to one of three functions …show more content…

Predictive validity refers to the adequacy of an instrument in differentiating between people’s performance on a particular measure if involves the degree to which criterion condition observed at a future time can be predicted (Mishel, 1998, Polit& Beck, 2010). 1.3 Construct Validity: Construct validity refer to how well a measure actually measures the construct it is intended to measure. It is related to the measure capturing the major dimension of the concept under study (Polit& Beck, 2010). The more abstract the concept, the more difficult it is to establish construct validity. Known group validation typically involves demonstrating that some scale can differentiate members of one group from another. The procedures in known group technique consist of an instrument being administered to be high and low on the measured concept. 1.4 face validity is the evaluation which the items in a scale adequately measure the construct. Face validity can be judged after the measure has been developed by potential measurement

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