✍️✍️✍️ Relationship Between Reliability And Validity

Tuesday, June 08, 2021 3:19:34 PM

Relationship Between Reliability And Validity

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Relationship between reliability \u0026 validity

It means if you are using a certain kind of instrument for a test and the results on the subjects you are testing is the same for the first and second try, then it is considered reliable. There are two ways in estimating whether a certain thing is reliable or not. The first way is the test or retest and the other is the internal consistency. The test and retest is quite easy. You simply test an idea twice, test 1 and test 2. It must be measured twice in different times, then compare the similarities of the results of the two tests. Then, if the results of the two tests are the same, it means that certain measurement is reliable.

The next way in estimating reliability is internal consistency. This can be done by questioning. Make different sets of question that can measure the same factor. Let this be answered by different people or different groups. And even if different people answered these different questions, but still came out with the right thought, then it must be reliable. This is the definition of reliability. Now to differentiate it with validity, it is best to define validity as well. In this way, the confusion between the two terms may be fixed.

With this it will be easier to distinguish the two from each other. Reliability and validity are, conceptually, quite distinct and there need not be any necessary relationship between the two. Be wary of statements which imply that a valid test or measure has to be reliable. Where the measurement emphasis is on relatively stable and enduring characteristics of people e.

It also ought to distinguish between inventors and the rest of us if it is a valid measure of creativity. A measure of a characteristic which varies quite rapidly over time will not be reliable over time - if it is then we might doubt its validity. For example, a valid measure of suicide intention may not be particularly stable reliable over time though good at identifying those at risk of suicide. The first concept indicates that scores change little when measured on different occasions, while internal consistency refers to the extent to which the items that make up the test measure the same psychological construct.

Therefore, a high reliability coefficient indicates that scores on a test fluctuate little internally and over time and, in short, that the instrument is free from measurement errors. When we talk about validity, we are referring to whether the test correctly measures the construct it intends to measure. This concept is defined as the relationship between the score obtained on a test and another related measure ; the degree of linear correlation between the two elements determines the coefficient of validity. Likewise, in scientific research, a high validity indicates the extent to which the results obtained with a given instrument or in a study can be generalized. There are different types of validity, which depend on how it is calculated; this makes it a term with very different meanings.

We can basically distinguish between content validity, criteria or empirical validity and concept validity. Content validity defines the extent to which the items in a psychometric test are a representative sample of the items that make up the concept to be assessed. The instrument must include all the fundamental aspects of construction; for example, if we are to do an appropriate test to measure depression, we will necessarily have to include items that assess mood and decrease in pleasure.

Finally, concept validity is intended determine if the test measures what it intends to measure , For example of convergence with scores obtained in similar tests. Although these two psychometric properties are closely related, the truth is that they refer to clearly differentiated aspects. Reliability is a characteristic of the instrument, in that it measures the properties of the elements that compose it. On the other hand, the validity does not refer exactly to the instrument but to generalizations made from the results obtained through this.

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