Validity & Reliability

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Validity & Reliability da Mind Map: Validity & Reliability

1. Reiability: Stability of a test score over repeated administration, assuming nothing has changed.

1.1. Test-retest: administering the same test twice to the same group of individuals, with a small time interval between testing, and correlating the scores.

1.2. Alternate-forms: administer two alternate or equivalent forms of a test to the same group and correlate their scores.

1.3. Internal consistency: split-half or odd-even estimates and item-total correlations.These estimates should only be used the test measures a single or unitary trait.

1.3.1. Split-half and odd-even estimates divide a test into halves and correlate the halves with one another.These correlations are based on half tests, the obtained correlations underestimate the reliability of the whole test.

1.3.2. Kuder Richardson methods determine the extent to which the enitre test represents a single fairly consistent measure of a concept.

1.4. Internal consistency: tends to yield inflated reliablity estimates for speeded tests.

2. "A valid test measures what it is supposed to measure."

2.1. "Content validity: an assessement by systematically comparing a test item with instructional objectives to see if they match.This evidence does not need a numericalestimate of validity."

2.2. Criterion-related validity: established by correlating test scores with an external standard or criterion to obtain a numerical estimate of validity evidence.

2.3. 2 types of criterion related validity evidence: concurrent and predictive.

2.3.1. concurrent validity: correlating test scores with a criterion measure collected at the same time.

2.3.2. Predictive validity: correlate test scores with a criterion measure collected after a time has passed

2.4. Construct validity: finding whether test results correspond with scores on other variables as predicted by some rationale or theory.