What is a decile rating?
A decile is a 10% grouping. A school’s decile rating indicates
the extent to which it draws its students from low socio-economic
Decile 1 schools are the 10% of schools with the highest
proportion of students from low socio-economic communities,
whereas decile 10 schools are the 10% of schools with the lowest
proportion of these students. A decile does not indicate the
overall socio-economic mix of the students attending a school or
measure the standard of education delivered at a school.
Each state and integrated school (with the exception of health
camp schools, regional health schools, and Child, Youth and
Family schools), is ranked into a decile on the basis of the
indicator. The indicator is based on Census data for households
with school-aged children in each school’s catchment area.
When are deciles recalculated?
All school deciles are recalculated by the Ministry following
each 5-yearly Census.
What does the decile rating
Decile ratings determine the allocation of:
- Targeted Funding for Educational Achievement (TFEA)
- Special Education Grant (SEG)
- Careers Information Grant (CIG).
Can the decile rating be
Each year boards can seek a review if they believe that their
roll profile has changed since the last national review. The
annual review period is advertised in the Education Gazette at
the end of July / beginning of August, with the deadline for
review applications typically being the beginning of October.
How the decile is calculated
The following table describes the decile calculation process:
|| Each school provides all student addresses to the Ministry.
|| Student addresses are assigned to the smallest Census areas called meshblocks. A meshblock contains
around 50 households. Only Census information for households with school-aged children is used. The number and percentage
of students from each meshblock is determined.
|| The meshblock is examined against the five following socio-economic factors:
|| The proportion of households with equivalent income (adjusted for the number of adults and children in the household,
and the age of the children), in the lowest 20% nationally. Households with a member who is employed are usually
not included in this group nor are all households supported on a benefit.
|| The percentage of employed parents in occupations that are at skill levels 4 or 5 (of the 1 to 5 levels in the
Australia and New Zealand Standard Classification of Occupation (ANZSCO)). These include all labourers, all machine
operators and assemblers, and others who work in occupations at these lower skill levels irrespective of the sector/type/profession
|| The percentage of households with an equivalised crowding index greater than one. This index is the proportion
of household members per bedroom adjusted for the presence of children under 10, every two of whom are assigned to
share a bedroom; couples, and others are each assigned their own bedroom.
|| The percentage of parents with no tertiary or school qualifications.
|| The percentage of parents who directly (ie not as a partner) received a Domestic Purposes Benefit, Unemployment
Benefit or Sickness and Invalid’s Benefit in the previous year. It does not include parents receiving the Family
|| The five census factors are weighted by the number of students from each meshblock. This means that
meshblocks where only a few of a school’s students live will have little impact on its decile., while those having
more will have a greater impact.
|| Schools are ranked in relation to every other school for each of the five factors and receive a score
based on the percentile they fall into.
|| The five scores for each school are added together (without any weightings) to give a total. This
total gives the overall standing of the school in relation to all other schools in the country.
|| Schools are then placed into ten groups called deciles, each having the same number of schools.