Reliability and Validity






Reliability and Validity

Reliability and Validity are some of the main elements used in evaluating research. Reliability is defined as the uniformity of scores acquired by the same people as they are being reevaluated with a similar assessment on different circumstances (Catane, 2002). It shows the level in which a particular experiment or test is generating the same outcome. Validity is mainly concerned with identifying what the assessment is evaluating and how efficient it is in doing so.  It is used in determining the level in which a particular tool is constructive in evaluating that which it is built to evaluate (Catane, 2002).

Reliability and Validity are viewed as significant elements in the area of research. For example, reliability ensures that one is using consistent tools when carrying out their research. On the other hand, validity ensures that one acquires accurate for more effectiveness when carrying out their research.

Reliability involves obtaining the accuracy from the tool used for the evaluation process, and therefore, it ensures that a person obtains consistent and accurate results after carrying out a research. Two forms of reliability include external and internal reliabilities. The internal reliability is described as the extent to which several researchers provided a set of former produced constructs would equalize them with the information in the similar way to the original researcher (Strickland & Waltz, 2005).

In addition, other words used to explain internal reliability include constancy and auditability. It shows the level of which a measure can be dependable within itself. Internal reliability that involves self-report procedures including psychometric assessments and surveys can be examined by applying the split half technique. This method involves dividing an assessment into two sections and including the same person to participate in both sections. As a result, if they both generate the same results, it would show that the assessment possesses internal reliability.

External reliability is used in establishing whether autonomous researchers would determine similar observable facts within the same environment (Strickland & Waltz, 2005). It determines the level in which the measurement differs from one application to another. Procedures used in external reliability can be evaluated using the method known as test-retest. It involves the process of assessing the same individual during a particular period of the same assessment. If similar scores are generated, it is shown that the assessment possesses external reliability.

Another method of assessing reliability is known as parallel forms, and is a method of ensuring that memory effects do not happen by using a different type of a former and post assessments. However, for assessments to be applied with this strategy, they are expected to be parallel to the measurement results they give (Catane, 2002). This is achieved through calculating the coefficient of reliability on the results of two measurements taken by a similar set of topics.

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