difference between validity and reliability

They are used to demonstrate how a test compares against a gold standard (or criterion). That is, an employee who gets a high score on the validated 42-item scale should also get a high score on the new 19-item scale.Ĭoncurrent and predictive validity are both subtypes of criterion validity. However, in order to have concurrent validity, the scores of the two surveys must differentiate employees in the same way. You think a shorter, 19-item survey would be more time-efficient. You find out that there is an existing, previously validated instrument: a 42-item questionnaire measuring employee commitment with Likert scales. Let’s say you want to survey the employees of a popular gym equipment company. Example: Concurrent validityLet’s revisit your research project about employee commitment.

Concurrent validity exampleĪ common way to evaluate concurrent validity is by comparing a new measurement procedure against one already considered valid. However, remember that this type of validity can only be used if another criterion or existing validated measure already exists. If the results of the new test correlate with the existing validated measure, concurrent validity can be established. This demonstrates concurrent validity.Įstablishing concurrent validity is particularly important when a new measure is created that claims to be better in some way than existing measures: more objective, faster, cheaper, etc.Ĭoncurrent validity measures how a new test compares against a validated test, called the criterion or “gold standard.” The tests should measure the same or similar constructs, and allow you to validate new methods against existing and accepted ones. If the results of the two measurement procedures are similar, you can conclude that they are measuring the same thing (i.e., employee commitment). Then, compare their responses to the results of a common measure of employee performance, such as a performance review.

Ask a sample of employees to fill in your new survey.

Ask the same sample of employees to fill in both an existing (validated) survey and your new survey.

Example: Concurrent validityYou want to assess the concurrent validity of a new survey measuring employee commitment.

It is called “concurrent” because the scores of the new test and the criterion variables are obtained at the same time. It compares a new assessment with one that has already been tested and proven to be valid.Ĭoncurrent validity is a subtype of criterion validity.

Try for free What Is Concurrent Validity? | Definition & ExamplesĬoncurrent validity shows you the extent of the agreement between two measures or assessments taken at the same time. non-probability samplingĮliminate grammar errors and improve your writing with our free AI-powered grammar checker.

Difference between validity and reliability