Validity and Reliability

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Validity and Reliability by Mind Map: Validity and Reliability

1. Estimates of reliability are obtained by administeraing the same test twice to the same group of individuals.

2. A reliable test will yield stable scored over repeated administrations, assuming the trait being measured has not changed.

3. Construct Validity Evidence

3.1. Determined by finding whether test results correspond with scored on other variables as predicted by some rationale or theory

4. Validity

4.1. A valid test measures what its supposed to measure

5. Content Validity Evidence

5.1. Systematically comparing a test item with instructional objectives to see if they match.

5.2. Does not yield a numerical estimate of validity evidence.

5.3. Tests

6. Criterion-related Validity Evidence

6.1. Established by correlating test scored with an external standard or criterion to obtain a numerical estimate of validity evidence.

6.2. Two Types of criterion related validity evidence

6.2.1. Concurrent Validity Evidence

6.2.1.1. Established by correlating test scores with a criterion measure collected at the same time.

6.2.2. Predictice Validity Evidence

6.2.2.1. Determined by correlating test scores with a criterion measure after a period of time has passed

7. Interpreting Validity Evidence

7.1. Adequacy of validity evidence depends on the strength of the validity coefficient and the purpose the test is being used for.

7.2. Group variability affects the strength the strength of the validity coefficient

7.3. Validity coefficients should be considered in terms of the relevance and reliability of the criterion standard

8. Test-retest or Stability

8.1. There is a small time interval between testing, and correlating the scores.

9. Reliability

9.1. The stability of a test score over repeated administration.

10. Alternate Forms or Equilvance

10.1. Giving two alternate forms of a test to the same group and correlating their scores.

10.2. Two equivalent forms of the test must be available, and they must be administered under conditions as nearly as equivalent as possible.

11. Internal Consistency

11.1. Split half or Odd/Even Estimates

11.1.1. Divide a test into halves and correlate the halves with one another.

11.2. Item total correlations

11.2.1. Determine the extent to which the entire test represents a single, fairly consistent measure of a concept.

12. Reliability Coefficients

12.1. Group variability affects test score reliability. As group variability increases, reliability goes up.

12.2. Scoring reliability limits test scores reliability. As scoring reliability goes down, so does the test's reliability.

12.3. Test length affects test scores reliability. As test length increases, the test's reliability tends to go up.

12.4. Item difficulty affects test score reliability. As items become very easy or very hard, the test's reliability goes down.