Validity of NNAT2
Validity refers to how well a test measures what it is purported to measure.
While reliability is necessary, it alone is not sufficient. For a test to be reliable, it also needs to be valid.
1. Face Validity ascertains that the measure appears to be assessing the intended construct under study.
2. Construct Validity is used to ensure that the measure is actually measure what it is intended to measure
3. Criterion-Related Validity is used to predict future or current performance - it correlates test results with another criterion of interest.
4. Formative Validity when applied to outcomes assessment it is used to assess how well a measure is able to provide information to help improve the program under study.
5. Sampling Validity ensures that the measure covers the broad range of areas within the concept under study.
Validity tests and data have been reported
The NNAT2 has several attributes making it a fair test for a variety of students:
· No verbal content
· No motor requirement
· Fair for hearing impaired
· Culturally neutral/fair content
· Universal content
· No reading requirement
· Control for bias
NNAT2 Test administrators should carefully follow all administration directions. Deviations from the directions provided could reduce the validity of the test results.