Wide Range Achievement Test (WRAT)

CWCS has chosen the WRAT (version 4) as the assessment test to be administered yearly to Transitional Kindergarten students (once the student turns 5). This test is a brief achievement test measuring reading, spelling, and arithmetic. It is a valuable instrument to assist in diagnosing levels of academic achievement and checking progress in academic programs.

Standard Score Interpretation

Raw scores by themselves give little useful information about a student's performance on a subtest because the subtests vary both in terms of their difficulty and the number of items they contain. Therefore to interpret subtest raw scores, they must be converted based on the performance of a standardization sample.

Standard scores for the WRAT4 subtests range from a low of 55 to a high of 145 and have a mean of 100 and a standard deviation of 15. A standard score above 100 is above the mean, whereas a standard score below 100 is below the mean. A standard score of 85 is one standard deviation below the mean, a standard score of 115 is one standard deviation above the mean, a standard score of 70 is two standard deviations below the mean, and so forth. The bell curve below presents a helpful classification of standard scores in terms of qualitative descriptions of levels of performance:

WRAT 4 Scale

Caution Regarding Grade Equivalents

Although grade equivalents appear to be easily understood and seem to convey an obvious meaning, they are often misinterpreted. For example, suppose a third grade student received a grade equivalent of 5.2 on the Math Computation subtest. This result does not mean that the student's math performance is similar to that of students in the second month of fifth grade and that the student could successfully perform fifth grade math.

For more information about your student's WRAT scores, please contact your Education Specialist.

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