22Average DMI score

22 Average DMI score

(1) A school’s average DMI score is: (a) for 2020—the average of the DMI scores for the school for 2018 and 2019; or (b) for a later year—the average of the DMI scores for the school for the 3 years before that year. (2) A number worked out under subsection (1) must be rounded to the nearest whole number, rounding up a number that ends in .5. (3) However, if, for 2022 or a later year, the number worked out under subsection (1) for a small school or a very small school for the year is 3 or more higher or 3 or more lower than the school’s CTC score for the previous year, the average DMI score is taken to be 2 higher or 2 lower (as applicable) than the school’s CTC score for the previous year. (4) A school’s DMI score for a year is worked out as follows:

Method statement

Step 1. Use the DMI methodology document to determine the annual income of each person responsible for a student at the school for the year.

Step 2. Add the annual incomes of each person responsible for each student at the school for the year to work out the family income for each student.

Step 3. Use the family income for each student at the school for the year to calculate the median family income for the school for the year.

Step 4. Calculate the standardised and weighted family income for the school using the median family income of all schools for the year, the number of students at the school for the year and the number of students at all schools for the year as set out in the DMI methodology document. The result is the school’s DMI score for the year.