Relationship Between Standard Score, Percentile Rank, and Classification Score Range Thus, a percentile rank of 6 would indicate that only 6 children out of a hundred in a comparison group (similar age and education level) would score as low or lower. Percentile RankĪ percentile rank (PR) describes a child’s relative standing to his or her peers on a scale of 1 – 100. For example, if a child named John had a standard score of 85 in the calculation test, he would be functioning in the low average range for that particular skill. In other words, the average standard score is 100 with a standard deviation of 15. The standard score (SS) on the WJ-IV describes a child’s performance relative to the average performance of the comparison group.
For example, if a child named Rita, a 7th grader, received a GE of 6.5 on the Reading Fluency test, the correct interpretation would be, “Rita is a 7th grader who currently performs at the mid-sixth grade level in reading fluency.” Comparison with Peers Standard Score For example, if a child named Sam is 8 years old and receives an AE of 12.1 on a particular test, the correct interpretation would be, “Test results indicate that Sam’s performance on this test is comparable to that of an average 12 year old.” Grade equivalentĪ grade equivalent (GE), or grade score, likewise reflects the child’s performance in terms of the grade level of the norming sample at which the average score is the same as the child’s raw score. Level of Development Age equivalentsĪn age equivalent (AE), or age score, reflects the child’s performance in terms of age level in the norming sample at which the average score is the same as the child’s score. Privacy Protected - We do not sell or share your information with anyone.By submitting you agree to 's terms of use.