CogAT Scores: Understand Test Results
CogAT scoring is based on your child’s age (not grade level). Your child will receive what’s called an SAS, or “Standard Age Score,” which compares your child’s score against other children in the same age range. The highest SAS that a child can receive on the CogAT is 160, while 100 is considered to be an average score.
Here are all the steps used to calculate a child’s unique test score:
- Raw Score. This is total number of questions answered correctly; however, incorrect answers do not cause points to be deducted from the overall raw score.
- Universal Scale Score (USS). After the Raw Score is determined, it is converted to a normalized standard score known as the Universal Scale Score. There are separate USS scores for each of the test’s three verbal, nonverbal and quantitative reasoning skills subsections (also called “batteries”). The Composite USS is determined by averaging these three different scores. The USS is a type of normalized standard score that follows a consistent scale from kindergarten through 12th grade for the CogAT. After a student’s raw score (the total number of questions answered correctly) is determined, it is converted to the USS. The conversion involves statistical procedures that ensure the scores are not influenced by variations in difficulty across different forms of the test. The USS are calculated separately for each of the test’s three batteries: verbal, nonverbal, and quantitative reasoning skills. This allows an evaluator to understand a student’s individual strengths and weaknesses across different types of cognitive abilities.
- Standard Age Score (SAS). The Standard Age Score has a maximum possible score of 160; the average score is 100. T
- Percentile Rank (PR). School districts use this number to compare students that share the same age and grade level. A percentile rank of 80 means that child’s score was higher than 80% of students who took the same test. The average percentile rank is 50.
- Stanine (S). A stanine is a very broad, simplified score ranging from 1 (lowest) to 9 (highest possible), and it’s normalized for the child’s age and grade level.
The CogAT is scored based on a student’s raw score, which is the total number of correct answers they provide on the test. The raw score is then converted into a scaled score, which takes into account the difficulty level of the questions answered and is reported on a scale from 100 to 150. The scaled scores for each of the three batteries (verbal, quantitative, and nonverbal) are then combined to give a composite score, which is also reported on a scale from 100 to 150.
It’s important to note that the CogAT is a norm-referenced test, which means that a student’s scores are compared to the scores of other students of the same age and grade level who have taken the test before. The student’s scores are then reported as a percentile rank, which indicates the percentage of students who scored lower than the student on the test. For example, if a student has a percentile rank of 90, it means that they scored better than 90% of students who took the test.
Stanine and Percentile Ranking and Scoring for the CogAT
Each stanine is made up of a range of percentile ranks. The table below shows the percentile ranks that formulate each stanine and the associated ability level.
|1||1 – 3||This score represents the lowest 4% of scores and is considered to be a very low score. Students with this score demonstrated fewer cognitive abilities compared to their peers.|
|2||4 – 10||This score represents the next 7% of scores. Students with this score are still well below the average range. They may struggle with tasks that require the cognitive skills tested by the CogAT.|
|3||11 – 22||This score represents the next 12% of scores. Students with a Stanine 3 are below average in the cognitive abilities tested by the CogAT.|
|4||23 – 39||This score represents the next 17% of scores. Students with this score fall slightly below the average range but are close to the middle.|
|5||40 – 59||This score represents the next 20% of scores. Students with this score fall in the middle of the range, showing average cognitive abilities compared to their peers.|
|6||60 – 76||This score represents the next 17% of scores. Students with a Stanine 6 are slightly above average in the cognitive abilities tested by the CogAT.|
|7||77 – 88||This score represents the next 12% of scores. Students with a Stanine 7 score are above average in the cognitive abilities tested by the CogAT.|
|8||89 – 95||This score represents the next 7% of scores. Students with this score are well above average in the cognitive abilities tested by the CogAT.|
|9||96 – 99||This score represents the highest 4% of scores and is considered to be a very high score. Students with this score demonstrated superior cognitive abilities compared to their peers.|
Remember, these scores and percentiles are norm-referenced, meaning they are determined by comparing an individual student’s performance to the performances of a large, representative sample of students of the same age or grade level. As such, they provide a way of understanding a student’s cognitive abilities relative to other students.
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