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Percentile/SFO Comparison Charts. Data and Evaluation Division Feb 2008. Purpose of presentation. To explain to schools the replacement for the Like School Group approach, the Percentile/SFO Comparison Charts. Topics. The Problem The Previous Solution (LSGs) Alternatives Considered

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Percentile sfo comparison charts

Percentile/SFO Comparison Charts

Data and Evaluation Division

Feb 2008


Purpose of presentation
Purpose of presentation

To explain to schools the replacement for the Like School Group approach, the Percentile/SFO Comparison Charts.


Topics
Topics

  • The Problem

  • The Previous Solution (LSGs)

  • Alternatives Considered

  • Percentile/SFO Comparison Charts


The problem
The Problem

How does my school’s student achievement score compare to other schools, given that my school is “different” to the average school?


The previous solution lsgs
The Previous Solution - LSGs

  • “Like” school groups (LSG) commenced in 1996

  • Created so schools could compare their performance to “similar schools”

  • 9 LSGs based on two measures;

    • EMA/Youth Allowance: proportion of students in school in receipt of EMA or Youth Allowance

    • LBOTE: proportion of students from a language background other than English


LSG chart

  • Good acceptance overall, but weaknesses are now apparent

  • Weaknesses include:

    • Schools close to a boundary (unfairly compared to all schools in LSG)

    • EMA/Youth Allowance data no longer available

    • LSGs are of unequal size (no. of schools in LSG4 is almost 10x that in LSG3)


Alternatives considered
Alternatives considered

1) Like School Sphere

  • For each school, compare results to performance of 19 nearest schools (in terms of SFO and maybe LBOTE, enrolment)

  • Gets extremely complicated statistically

    2) Percentile/SFO Comparison Charts


Student family occupation sfo densities
Student Family Occupation (SFO) densities

  • Indicator of socio-economic status

  • SFO accounts for 38% of variance in student achievement

  • LBOTE only accounts for an additional 5%

  • Used in Student Resource Package

  • 4 years of SFO data (2004-2007)


2005 sfos for primary pri sec schools sorted from highest to lowest socio economic status ses
2005 SFOs for primary & pri/sec schoolssorted from highest to lowest socio-economic status (SES)

Lowest SES

22nd

percentile

Highest SES

Highest SES


78% of schools have a student population from a higher socio-economic background

22% of schools have a student population from a lower socio-economic background

Nameless Primary School


2005 aim year 3 reading mean scores sorted from lowest to highest score
2005 AIM Year 3 Reading mean scores socio-economic backgroundsorted from lowest to highest score

Lowest scoring school

Highest scoring school


Nameless Primary School socio-economic background

If socio-economic status, as measured by SFO, was the sole determinant of student achievement, you’d expect the school’s achievement percentile to be in the same vicinity as the SFO percentile.

20% of schools have a lower AIM score


2005 sfos for primary pri sec schools sorted from highest to lowest socio economic status ses1
2005 SFOs for primary & pri/sec schools socio-economic background sorted from highest to lowest socio-economic status (SES)

Lowest SES

Highest SES

Highest SES


Nameless Primary School socio-economic background

The (up to) 20% of schools that are most like this school in terms of SFO.


Nameless Primary School socio-economic background


Literacy socio-economic background


Literacy socio-economic background


Numeracy socio-economic background


Student Absence socio-economic background


Staff Opinion Survey socio-economic background

Parent Opinion Survey

Student (Attitudes to School) Survey


Value add no
Value-add? No socio-economic background

  • Not an attempt at value-add

  • Simply is what it is

  • If SFO was the sole determinant of student achievement, a school’s student achievement percentile would be within the “vicinity” of its SFO percentile. If it’s above (or below), the school could hypothesise why.


Percentile sfo comparison charts principles behind
Percentile/SFO Comparison Charts socio-economic backgroundPrinciples behind

  • Use Student Family Occupation (SFO) only as best predictor of student achievement

  • Examine student achievement and SFO percentiles together

  • Keep it simple

  • Use lots of data, over time, across strands (don’t rely on any one bit of data)

  • Combine the data with the school context to get the full story


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