blackcat, the NCE is not a percentile, so your DDs NCE is an 85, not the 85th percentile. The NCE score of 85 is mathematically equivalent to the 95th percentile. As aeh stated, the NCE score uses a normal distribution with a mean of 50 and a standard deviation of 21.063. So, an NCE of 85 is 35 points above the mean of 50 (85-50 = 35). Therefore, a score of 85 is 35/21.063 = 1.662 standard deviations above the mean. A standard score of 1.662 standard deviation above the mean of a normal distribution IS the 95.2 percentile. So an NCE of 85 is mathematically equivalent to the 95th percentile. This is the same idea as a WISC score of 125 is equivalent to the 95th percentile (since WISC scores have a mean of 100 and a standard deviation of 15).
Hope this helps and doesn't confuse the matter even more
