Validity of Information

Validity of Information

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Validity of Information

Validity is defined as the strength or the best possible approximation of the truthfulness or false-fullness of an inference , proposition or conclusion . On the other hand , reliability is the ability of a tool to measure in the same manner each time and every time , what it is set out to measure . If the score measured out of an instrument for a person given each time , then the instrument is said to be reliable . Validity can help

to determine if a particular intervention has an effect on a particular outcome . There are 4 types of validity , namely conclusion validity , internal validity , construct validity and external validity Conclusion validity tries to establish a link between the intervention and the observed outcome . Internal validity tries to determine a causal relationship between the intervention and the outcome . Construct validity tries to establish if the manner in which the concepts were put together resulted in an actual causal relationship over the outcome External validity would generalize the results of a particular study to other situations . Reliability , on the other hand , can be estimated in two ways , one is by test-retest , and the other is by internal consistency . Test-retest method is a conservative way of determining reliability and has three components : - implementing the tool at 2 particular times , calculating the correlation between the 2 separate recordings , and also verifying that the testing conditions used in both instances were the same . Internal consistency is a...