Before revision: Calculation Test scores are scaled to stanine scores using the following algorithm: Rank results from lowest to highest Give the lowest 4% a stanine of 1, the next 7% a stanine of 2, etc., according to the following table: + Calculating Stanines Result Ranking4%DIF < 7%12%17%20%17%12%7%4% Stanine123456789 Standardizedscore below −1.75 −1.75 to −1.25 −1.25 to −0.75 −0.75 to −0.25 −0.25 to +0.25 +0.25 to +0.75 +0.75 to +1.25 +1.25 to +1.75 above +1.75 Wechslerscale score below 74 74 to 81 81 to 89 89 to 96 96 to 104 104 to 111 111 to 119 119 to 126 above 126 The underlying basis for obtaining stanines is that a normal distribution is divided into nine intervals, each of which has a width of 0.5 standard deviations excluding the first and last, which are just the remainder (the tails of the distribution).
After revision: Calculation Test scores are scaled to stanine scores using the following algorithm: Rank results from lowest to highest Give the lowest 4% a stanine of 1, the next 7% a stanine of 2, etc., according to the following table: + Calculating Stanines Bracketedproportion4%DIF > 7%12%17%20%17%12%7%4% Stanine 1 |3 4 5 6 7 8 9 Standardizedscore below −1.75 −1.75 to −1.25 −1.25 to −0.75 −0.75 to −0.25 −0.25 to +0.25 +0.25 to +0.75 +0.75 to +1.25 +1.25 to +1.75 above +1.75 Wechslerscale score below 74 74 to 81 81 to 89 89 to 96 96 to 104 104 to 111 111 to 119 119 to 126 above 126 The underlying basis for obtaining stanines is that a normal distribution is divided into nine intervals, each of which has a width of 0.5 standard deviations excluding the first and last, which are just the remainder (the tails of the distribution).