reliability
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| Reliability | The degree of consistency that a measuring method or device produces.
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| Intrarater reliability: | The consistency of repeated measurements of the same observation by the same rater.
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| Interrater reliability: | The consistency of repeated measurements of the same observation by different raters.
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| Validity Validity | is the degree to which data or results of a study are correct or true.
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| Concurrent validity: | The degree to which the measurement being validated agrees with an established measurement standard administered at approximately the same time. Concurrent validity is a form of criterion validity.
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| Construct validity: | The relationship between an instrument and an established theoretical framework. Construct validity is based on theory and not statistical analysis.
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| Content validity: | The degree to which the indicator provides a complete representation of the domain of interest.
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| Criterion validity: | The degree to which a relationship exists between a measurement being validated and other measures.
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| External validity: | The degree to which results of the research study are generalizable.
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| Internal validity: | The degree to which the reported outcomes of the research study are a consequence of the relationship between the independent and dependent variables and not the result of extraneous factors.
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| Predictive validity: | The ability of an instrument to predict the occurrence of a future behavior or event. Predictive validity is a form of criterion validity.
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