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.
Score Classification
130-above Very Superior
120-129 Superior
110-119 High Average
90-109 Average
80-89 Low
70-79 Borderline
69-below Extremely Low
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
*Note: The WIAT is an achievement test that measures how an individual is doing in areas of academic work. It will give a summary of achievement and understanding in subjects like reading, math, written language, and oral language.
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