Naglieri Nonverbal Ability Test (NNAT)

1. Naglieri Nonverbal Ability Test (NNAT) Miami-Dade County Public Schools NNAT Workshop March 26, 28, & 29, 2007

2. NNAT Description • The NNAT is a brief, culture-fair, nonverbal measure of ability. • NNAT items assess ability without requiring the student to read, write, or speak. • NNAT uses abstract figural designs and does not rely on verbal skills or achievement.

3. Use NNAT to ... • Measure ability without verbal content • Measure ability without speed requirement • Measure ability without motor requirement • For unbiased assessment • Identify gifted minority children • Evaluate students with hearing impairment

4. Advantages of NNAT • Culturally fair content • All nonverbal items • Universal content • No reading required • Items do not measure achievement • Little motor skills required • Excellent psychometric qualities • Administered in 30 minutes

5. NNAT Structure & Development

6. Seven levels 38 items per level Items selected based on item difficulty correlation to total test bias analyses fit statistics Level Grades A K B 1 C 2 D 3 & 4 E 5 & 6 F 7 - 9 G 10 - 12 Structure of NNAT

7. NNAT Development • Each level overlaps with adjacent ones • Each level tailored to a specific age • Each level has excellent floor and ceiling • Each level has several types of items

8. Progressive Matrix Structure • Every part of the matrix must be related to every other • Rows and columns must be combined • The child integrates stimuli into groups and sees them as a whole ? ?

9. NNAT Item Clusters • NNAT item types identified from past research (J. Carlson & C. Jensen, 1980; J. Naglieri & W. Insko, 1986) • The NNAT has the following item types: • Pattern Completion • Reasoning by Analogy • Serial Reasoning • Spatial Visualization • Note: These are NOT different types of intelligence

10. NNAT Levels and Clusters LevelPCRASRSV A Yes Yes - - B Yes Yes Yes - C Yes Yes Yes Yes D Yes Yes Yes Yes E Yes Yes Yes Yes F - Yes Yes Yes G - Yes Yes Yes

11. 1 2 3 4 5 Pattern Completion ? ?

12. 1 2 3 4 5 Reasoning by Analogy ? ?

13. 1 2 3 4 5 Serial Reasoning ?

14. 1 2 3 4 5 Spatial Visualization ?

15. NNAT Sample Items

16. Sample ? 1 2 3 4 5

17. 1 ? 1 2 3 4 5

18. 2 ? 1 2 3 4 5

19. 4 3 ? 1 2 3 4 5

20. 4 ? 5 1 2 3 4

21. 5 ? 5 1 2 3 4

22. 6 ? 5 1 2 3 4

23. 7 ? 5 1 2 3 4

24. NNAT Scores

25. Score Types & Definitions • Raw Score: The number of items answered correctly • Scaled Score: A statistical conversion of the raw score that allows comparison of scores across levels • Nonverbal Ability Index (NAI): A normalized, standard score • Percentile Rank: Indicates the relative standing of a student in comparison with other students of the same age or grade • Stanine: A normalized, standard score with a range of 1 to 9 • Performance Category: An indicator of student performance on the overall test or a cluster

26. Summary of NNAT Scoring • Raw Scores are converted to scaled scores BY LEVEL • Scaled scores are converted to NAI Scores BY AGE (in 1/4 year intervals) • Percentiles and Stanines are provided for Scaled Scores and NAI Scores • Age Equivalents are given for Scaled Scores

27. NNAT Reliability & Validity

28. NNAT Standardization • Sample of 89,600 children • Grades K - 12 • Similar to the US sample according to: • Geographic Region • Socioeconomic Status • Urban/Suburban • Ethnicity • Type of School

29. NNAT Internal Reliability LevelReliabilityN A .86 997 B .84 1,649 C .82 2,256 D .85 4,671 E .87 4,633 F .87 6,132 G .87 2,329

30. NNAT Conclusions • NNAT is a culture-fair, language-free measure of ability • NNAT has excellent reliability and validity • Brief administration time (30 minutes) • Uses nonverbal items without achievement • Normed on a large sample of children • Accurate identification rates for gifted children