Entire range or universe of the construct is measured. Question-is there any time when face validity is not desirable?ħ Content validity Content of the measure is justified by other evidence, e.g. Face validity is sometimes considered a subtype of content validity. Concept=pain level Measure=verbal rating scale “rate your pain from 1 to 10”. “intuitive, arrived at through inspection” e.g. face content construct concurrent predictive criterion-relatedĦ Face validity Just on its face the instrument appears to be a good measure of the concept. Observed Score=true score + error variance (actual score obtained) (stable score) (chance/random error) (systematic error)ģ Validity The accuracy of the measure in reflecting the concept it is supposed to measure.Ĥ Reliability Stability and consistency of the measuring instrument.Ī measure can be reliable without being valid, but it cannot be valid without being reliable.ĥ Validity The extent to which, and how well, a measure measures a concept. 1 Reliability and Validity of Research InstrumentsĪn overview Reliability and Validity of Research InstrumentsĢ Measurement error Error variance-the extent of variability in test scores that is attributable to error rather than a true measure of behavior.
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