Reliability and Validity

Table of Content

Reliability determines how consistently a measurement of skill or knowledge yields similar results under different conditions. Reliability is also known as a measurement of the internal consistency, stability of a measuring device. Reliability establishes how consistently a capacity of proficiency, comprehension concedes comparable consequences and fluctuating circumstances. If a quantity has a high reliability, it would generate a dependable outcome.

Reliability has four primary ways to assess the reliability measure:

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  1. Internal Observer established by the degree to which unusual spectators or inspectors observe the identical performance presentation forecast documents or other totals that progress on one or more components.
  2. Test and Retest are determined by the extent to which the same test or kind of presentation is compared at two separate times considering alike outcome.
  3. Parallel Forms determined by the extent to which two different measurements of information or generate similar solutions.
  4. Split Half Reliability is established by evaluating a partial set of test elements with partial and establishing the level to which the parallel concludes.

Reliability is decisive for many parts of our everyday lives, including medicines, sports, and manufacturing. Reliability is such a vital instrument theory that has been demarcated as a relevance to an expansive collection of accomplishments. Validity

Validity refers to the quantity to which an analysis precisely exhibits or retrieves the exact idea that the investigator is trying to calculate. Validity is apprehension with the analysis’s a triumph at calculating what the investigators commence to calculate. Researchers should be alarmed with both peripheral and inner validity. External validity insinuates to the level to which the consequences of a report are simplifying or negotiable. Internal validity speaks of (a) the severity with which the report was handled, (b) the level to which the creator of a report has taken into reason, substitute clarifications for any unintended liaisons only the primary of these definitions should be well thought-out when evaluating internal validity. Face validity is interested in how a calculation or process occurs. Unlike content validity, face validity does not hang on recognizing hypothesis for support (Fink, 1995).

Criterion related validity also implied to as instrumental validity is often used to explain the correctness of a calculation or process by evaluating it with another calculation or process which has been proven to be reasonable. Construct validity pursues dispute linking a hypothetical notion and an exact calculating apparatus process. Construct validity can be divided into two sub-groups convergent validity and discriminate validity. Convergent validity is the authentic universal agreement between evaluations congregated objectively individually where quota should be in theory associated. Discriminate validity is the deficiency of a connection, surrounded by proceedings which in theory would not be correlated.

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Reliability and Validity. (2016, Nov 05). Retrieved from

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