A stanine is a “standard ninth,” an interval used in dividing school test results into (more or less) ninths. Stanine 1 includes all scores less than 1.75 standard deviations below the mean, and stanine 9 all scores more than 1.75 standard deviations above the mean. Stanines 2-8 are each 1/2 of a standard deviation wide, so the mean falls in the center of stanine 5.
Statistics and data science, defined
Stanine
Where this gets used
We teach data science and statistics online, one subject at a time, on fixed start dates with an instructor who marks your work.