Principles of Validity
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| The extent to which an instrument measures what it is intended to measure is? | Validity
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| This form of validity indicates that an instrument appears to test what it is supposed to. | Face Validity
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| This form of validity is the least vigorous, typically observable, and scientifically weak. | Face Validity
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| This form of validity indicates that the items that make up an instrument adequately sample the universe of content that define the variable being measured. | Content Validity
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| This validity is most useful with questionnaires and inventories. | Content Validity
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| This form of validity is based on the ability of one test to predict results obtained on an external criterion. | Criterion-related Validity
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| This form of validity is the most practical and objective approach to validity testing. | Criterion-related Validity
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| _________ validity compares results to "gold standard" | Criterion-related Validity
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| This form of validity reflects the ability of an instrument to measure an abstract concept. | Construct Validity
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| The ability to obtain a positive test when condition is really present is know as? | Sensitivity
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| A true positive = | Sensitivity
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| The ability to obtain a negative test when the condition is really absent is known as? | Specificity
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| A true negative = | Specificity
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| What is the formula for prevalence? | [(A+B)/(A+B+C+D)] X 100
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| What is the formula for sensitivity? | [(A/(A+C))] X 100
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| What is the formula for specificity? | [(D/(B+D))] X 100
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| What is the formula for positive predictive value? | [(A/(A+B))] X 100
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| What is the formula for negative predictive value? | [(D/(C+D))] X 100
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| Sensitivity or specificity is more important when risk associated is high? | Sensitivity
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| Sensitivity or specificity is more important when costs or risks for further intervention are substantial? | Specificity
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Created by:
txst fall 2008
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