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PVAAS – Pennsylvania Value-Added Assessment System The TWO PVAAS Methodologies. Looking Forward/Planning… PVAAS Projection Reports For Individual Students and Cohorts of Students.

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PVAAS – Pennsylvania Value-Added Assessment System

the two pvaas methodologies
The TWO PVAAS Methodologies

Looking Forward/Planning…

PVAAS Projection Reports For Individual Students and Cohorts of Students

Looking Back/Evaluation…

Value-added Growth Reports For Cohorts of Students


NO individual student growth measure

pvaas is
  • A statistical analysis of existing assessment data (PSSA).
  • A realistic measurement of a school’s progress/growth over time.
  • Progress data to add to achievement data as schools are analyzing their work with students and making improvement plans.
pvaas is not
  • Another test.
  • A method for providing a measure of growth for an individual student.

Current Data Collection


High Achievement

Average Achievement

Low Achievement

Achievement is based

on each student’s ending point.


PVAAS Adds Another Variable To Achievement…Progress




At or Above



Progress is based

on each student’s starting point.

scatter plot quadrants and their meanings
Scatter Plot Quadrants and Their Meanings

Achieving but Slipping


Underperforming and Slipping

Underperforming but Improving

scatter plot comparison

Scatter Plot Comparison

State vs. IU 12 vs. YCSD

Math and Reading

Grades 4 – 8

11 th grade scatterplots
11th Grade Scatterplots

The PSSA-PVAAS Scatter Plots visually display the following data from the statewide distribution of PSSA results for 2009-10:

  • Achievement
    • The mean predicted performance of the cohort.
    • The actual mean performance of all students in the state is displayed for reference
  • Growth
    • School Effect ≈ Observed Mean – Predicted Mean
    • Standardized School Effect = School Effect relative to its error – displays degree of confidence

The following two slides explain the meaning of each of the regions of an 11th grade scatter plot.

the scatter plot coordinate system for grade 11
The Scatter Plot Coordinate System for Grade 11

Vertical Axis

Mean Predicted Scaled Score

Growth Descriptor

Boundaries (±2SEs)

Horizontal Axis

Growth Measure in Standard Errors

2010 Mean Scaled Score

scatter plot regions and their meanings for grade 11
Scatter Plot Regions and Their Meanings for Grade 11

Higher Performing

Met Expectations

Higher Performing

Below Expectations

Higher Performing

Above Expectations

Lower Performing

Above Expectations

Lower Performing

Below Expectations

Lower Performing

Met Expectations

pvaas reporting
PVAAS Reporting
  • District Level Reporting
  • School Level Reporting
  • Grade Level Reporting
    • Reading (Grades 4-8, 11)
    • Math (Grades 4-8, 11)
    • Science (Grades 4, 8, 11)
    • Writing (Grades 5, 8, 11)
  • Subgroups Reporting (ex. IEP, ED, ELL)
  • Performance Levels (Advanced, Proficient, Basic, Below Basic)
  • Student Level Reporting
    • Reading, Math, Science, Writing (grades vary based on content area)

Have all of our groups of students experienced one year of academic growth during the last school year?

Value-added Growth Reports

how are our best students our average students our struggling students growing

How are our best students, our average students, our struggling students growing?

Performance Diagnostic Report

growth standard methodology what the whiskers tell us
Growth Standard MethodologyWhat the whiskers tell us…

Exceeded Growth Standard;

More than One Year’s Growth


Met the Growth Standard;

Made One Year’s Growth


Growth Standard (One Year’s Growth)

Below Growth Standard;

Less than One Year’s Growth


predictive methodology what the whiskers tell us
Predictive MethodologyWhat the whiskers tell us…

ABOVE Expectations -- Observed Score Was Greater Than Predicted Score

NDD – No Detectable Difference Between Observed Score and Predicted Score

Observed – Predicted (One Year’s Growth)

BELOW Expectations -- Observed Score Was Less Than Predicted Score

student projection methodology
Student Projection Methodology
  • A separate longitudinal modeling process focused on the performance scores of individual students.
  • The model uses all of the available data (both math and reading) to project future PSSA performances in Math, Reading, Science and Writing.
  • Projections can be calculated for an individual student or groups of students.
pvaas fall 2009 reporting projections to basic proficient advanced
PVAAS Fall 2009 Reporting: Projections to Basic, Proficient, Advanced

Grade PSSA

Last Taken

Grade PSSA

Last Taken

Grade PSSA

Last Taken