How is the WIAT Test Scored?

WIAT test scoring (Wechsler Individual Achievement Test-Third Edition) is based on several derivations of status scores and growth scores.

They are as follows:

• Status Scores
• Standard Score
• Percentile Rank
• Normal Curve Equivalent
• Stanines
• Growth Scores
• Grade Equivalent
• Age Equivalent
• Growth Scale Values

For standard scores, each number given shows the level at which your child is performing.

Very superior scores are scores over 130.

Superior scores range from 120-129.

High Average scores range from 110-119.

Average scores range from 90-109.

Low scores range from 80-89.

Borderline scores range from 70-79.

Extremely Low scores are scores under 69.

The administrators then use these scores to interpret performance by noting and comparing the following, noting the pattern of strengths and weaknesses:

• Growth Scale Values
• Grade-Based and Age-Based Scores
• Composite Scores
• Score Differences
• Statistical Significance of Score Differences
• – Frequency of Score Differences
• – Qualitative Evaluation of Subtest Component Score Differences
  • Out-of-Level Item Set Performance

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