Hi Jennie,
The charts to convert RIT scores to national percentiles are here starting on page 129. Using the middle of the math range (266) the score is just above the 99% for 8th grade math and ~98% for 9th grade. The reading is at the 96% for 8th grade.
http://pickens.it.schoolfusion.us/m...ssionid=14d1e9266e4482d198ebc39c6e6bc9c3Here's the link for the parent toolkit which has an explanation of how the RIT scale works.
http://www.nwea.org/support/article/930Since she's near the ceiling, I would look at having her take a different assessment like the SAT or ACT through a talent search program.
http://www.nwea.org/support/article/532 Why do RIT scales vary from subject to subject (e.g. the mathematics RIT scale goes higher than other subject areas)? A ceiling effect exists when an assessment does not have sufficient range to accurately measure students at the highest performance levels. It has nothing to do with the actual numbers attached to the scale and everything to do with the position of students on it. For example, in reading, the RIT scale measures with relative accuracy up to about 245. This represents the 93rd percentile at grade 10, and the 95th percentile at grade 8. If a student scores above we know that student performed high but may not be able to accurately assess how high they performed. Relative to other tests, therefore, there is very little true ceiling effect in this assessment. Even most high performing 10th graders receive a technically accurate measure of their skill.
Let me know if you have a more specific question I can help you answer.
