Download - ECRA local growth model
Local Growth Models for Accountability
2010
A value-added approach for Local Education Agencies to:
▪ Set individual student growth targets
▪ Incorporate student achievement in teacher evaluations
▪ Document return on investment for programs
▪ Support leadership and board governance
What are Value-Added Growth Models?
Value-added growth models are designed to answer a basic question that has frustrated educators for decades.
How do we know if a student or group of students performed any better than they would have anyway:
- In a different school?
- Under a different curriculum?
- With a different teacher?
- If they were not in a particular program?
Historically, our inability to answer this question has been related to the absence of control groups.
Sorting out the Terms
Growth models transition student achievement from an achievement status model to a model designed to rigorously capture student growth at the individual and aggregate level. Growth models help to address the following questions:
Typical: What is a typical year’s growth?
Actual: How much growth actually occurred?
Value-added models are a broad class of statistical models used to quantify value-added growth.
Aspiration: How much growth would we like to see?
Value-Added Model
How it Works
Class, School, Program, etc.
Projected AchievementWhat a student would have most likely achieved under typical district growth.
Actual Achievement
Math
24
Score
28
Statistical
Comparison
Value-added impact
Students and their historical achievement
The Meaning of Growth
Identify which students are at risk of not making grade-level proficiency
Examine which teachers, programs, and/or interventions are positively affecting student growth
Communicate the comparison of model projections to actual achievement.
ECRA promotes the use of Growth Percentiles. Growth percentiles express the difference between projected and actual achievement as a percentile. This enables schools and districts to:
Document whether each student’s growth was similar to, greater than, or less than typical growth
Set rigorous but attainable individual student growth targets.
Value-Added Growth Models: Steps
Use anchor years to develop a model that quantifies the typical growth for any individual student, given that student’s prior record of achievement.
Use the model to project the most likely future achievement for every student.
Compare model projections to actual achievement.
Below are the steps necessary to develop a value-added growth model.
Identify which summative assessments will be incorporated into your model.
Choose anchor years – the multiple historical years of data used to develop models.
Applications
Program evaluation
Board governance
Below are some applications of value-added growth models:
Individual student growth targeting
Teacher and administrator evaluation
Examples
Growth Model Development
Growth Model Development
Applications: Individual Student Growth Targets
Applications: Individual Student Growth Targets
Applications: Teacher Evaluations
Applications: Teacher Evaluations
Applications: Teacher Evaluations
Applications: Program Evaluation
Achievement growth for students in this program was typical of similar students not in the program.
21st Century Learning Program
Applications: Program Evaluation
Achievement growth for students in this program was greater than typical growth of similar students.
Reading Support Program
Applications: Leadership and Board Governance
The model can be applied to all district schools, programs, courses and interventions to quantify the student achievement return on investment.
Program # Students
Served
Financial Allocatio
n
Achievement Return (value added ACT points)
Reading Support 112 $250,000 0.8
21st Century Learning
248 $780,000 0.1
Summer Academy 58 $112,000 1.5
…
Example