Naglieri Nonverbal Ability Test NNAT MiamiDade County Public
Naglieri Nonverbal Ability Test (NNAT) Miami-Dade County Public Schools NNAT Workshop March 26, 28, & 29, 2007
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.
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
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
NNAT Structure & Development
Structure of NNAT • Seven levels • 38 items per level • Items selected based on Ø item difficulty Ø correlation to total test Ø bias analyses Ø fit statistics Level Grades A B C D K 1 2 3 & E 4
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
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 ? ?
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: Ø Pattern Completion Ø Reasoning by Analogy Ø Serial Reasoning Ø Spatial Visualization • Note: These are NOT different types of intelligence
NNAT Levels and Clusters Level PC RA SR SV A B C D E F G Yes Yes Yes - Yes Yes Yes Yes - Yes
Pattern Completion ? 1 2 3 4 5
Reasoning by Analogy ? 1 2 3 4 5
Serial Reasoning ? 1 2 3 4 5
Spatial Visualization ? 1 2 3 4 5
NNAT Sample Items
Sample ? 1 2 3 4 5
1 ? 1 2 3 4 5
2 ? 1 2 3 4 5
43 ? 1 2 3 4 5
4 ? 1 2 3 4 5
5 ? 1 2 3 4 5
6 ? 1 2 3 4 5
7 ? 1 2 3 4 5
NNAT Scores
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
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) Ø Percentiles and Stanines are provided for Scaled Scores and NAI Scores Ø Age Equivalents are given for Scaled Scores
NNAT Reliability & Validity
NNAT Standardization • Sample of 89, 600 children • Grades K - 12 • Similar to the US sample according to: Ø Geographic Region Ø Socioeconomic Status Ø Urban/Suburban Ø Ethnicity Ø Type of School
NNAT Internal Reliability Level A B C D E F G Reliability. 86. 84. 82. 85. 87. 87 N 997 1, 649 2, 256 4, 671 4, 633 6, 132 2, 329
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
- Slides: 30