## What is the test-retest method used for?

Test-retest reliability is a measure of reliability obtained by administering the same test twice over a period of time to a group of individuals. The scores from Time 1 and Time 2 can then be correlated in order to evaluate the test for stability over time.

## What does test-retest reliability mean?

Test-retest reliability assumes that the true score being measured is the same over a short time interval. To be specific, the relative position of an individual’s score in the distribution of the population should be the same over this brief time period (Revelle and Condon, 2017).

What is an example of test-retest reliability?

For example, a group of respondents is tested for IQ scores: each respondent is tested twice – the two tests are, say, a month apart. Then, the correlation coefficient between two sets of IQ-scores is a reasonable measure of the test-retest reliability of this test.

How do you evaluate test-retest reliability?

We calculate the test-retest reliability by using the Pearson Correlation Coefficient, which takes on a value between -1 and 1 where:

1. -1 indicates a perfectly negative linear correlation between two scores.
2. 0 indicates no linear correlation between two scores.

### Why do we use test-retest reliability?

Having good test re-test reliability signifies the internal validity of a test and ensures that the measurements obtained in one sitting are both representative and stable over time.

### Is test-retest method a research method?

Reliability is an important element of experiment or measurement of quality in a research. Test-retest method for assessment of reliability is one of the easiest way to estimate reliability in which the same test is given twice, after an interval of time, to the same individual.

How do you do a test-retest?

In order to measure the test-retest reliability, we have to give the same test to the same test respondents on two separate occasions. We can refer to the first time the test is given as T1 and the second time that the test is given as T2. The scores on the two occasions are then correlated.

What is the best definition of test-retest reliability quizlet?

Test-retest reliability is measured by administering a test twice at two different points in time. This kind of reliability is used to determine the consistency of a test across time. Test-retest reliability is best used for things that are stable over time, such as intelligence.

#### How can we determine if a test has good reliability quizlet?

A typical assessment would involve giving participants the same test on two separate occasions but close together in time. If the same or similar results are obtained then external reliability is established. A test-retest correlation of +. 70 or greater is considered to indicate good reliability.

What does validity of a test mean quizlet?

Test Validity. The degree to which a test measures what it is supposed to measure. Relevancy. Closeness of agreement between what a test measures and what it is supposed to measure.

What does the reliability of a test refer to quizlet?

A measure of consistency for tests and other instruments. Individuals are asked to take the test of interest and then take the same test again at a later date. The scores are then compared.