Table of Contents

Growth of Student Groups

There are two ways to view information on this report. You can View Growth by Subject Area or View Growth by Student Group for an individual district or school. Each table shows a subject or student group depending on which tab you select. Each row shows growth across all tests, grades, and courses for a subject or student group depending on which tab you select. Expand the rows to show growth by test, grade, or course. Each row displays the growth measure, standard error, index, and level where available.

You can expand or collapse the information in the table. To see all information in one table, click Expand at the top of the table. To see all information in each row, click the arrow beside the student group or subject.

Technical Details

This report is only available for some subjects.

This report provides district value-added measures for specific student groups, for example, students who are economically disadvantaged and students who are English Learners. In Tennessee, the student groups for which district value-added measures are available are:

  • All Students
  • Black/Hispanic/American Indian or Alaska Native
  • Economically Disadvantaged
  • English Learner
  • Special Ed
  • Super Subgroup

The collapsed row of each table is a growth index that combines grades 3-8 and EOC growth measures for that student group and subject.

When viewing growth by student group, there is an overall row at the bottom of each student group. This is the overall growth index that combines growth measures for that student group across all subject areas.

The minimum number of students required for the calculation of growth for a student group is the same as the general value-added reporting. There must be at least 10 students for the gain model or 10 students for the predictive model with sufficient testing history in a student group in a specific year, subject, and grade to receive a growth measure in that year, subject, and grade. The across-grades measures are calculated using the same thresholds for the minimum number of students. A user will not see a row for a group if there is not enough data available to provide a measure.

The same rules for excluding students from other value-added reports also apply to this report. These rules are described in Statistical Models and Business Rules.

A list of students for each student group is not available within this report. Many of the student groups can be found by selecting Student Search from the Reports menu and choosing Who last tested in along with the grade, race, and demographic.

Students are placed in groups based on data from their grades 3-8 or EOC assessments with some exceptions.

Understanding the Report

TVAAS uses two different approaches to generate the value-added reports, depending on the sequence of tests administered. See assessments analyzed with the gain model and assessments analyzed with the predictive model.

Growth Measure

Each growth measure is a conservative estimate of the academic growth a district's students made, on average, in a grade and subject or course. Because the growth measures are estimates, consider their associated standard errors as you interpret the values.

The growth measure is calculated differently for assessments analyzed with the gain model than it is for assessments analyzed with the predictive model.

See also: Measuring Growth.

Standard Error

All growth measures on the TVAAS reports are estimates. All estimates have some amount of measurement error, which is known as the standard error. This value defines a confidence band around the growth measure, which describes how strong the evidence is that the group of students exceeded, met, or fell short of expected growth.

For more information about standard errors, see Growth Measures and Standard Errors.

Calculating the Growth Index

The standard error is used in conjunction with the growth measure to calculate the growth index. Specifically, the growth index is the growth measure divided by its standard error. This calculation yields a robust measure of growth for the group of students that reflects both the growth and the amount of evidence. All index values are on the same scale and can be compared fairly across years, grades, and subjects throughout the state.

For some of the overall growth indices, a corresponding growth measure and standard error might not be possible. A user will not see a row for a group if there is not enough data available to provide a measure.

Effectiveness Levels

The Level column is color-coded to aid in interpretation. The colors indicate how strong the evidence is that the student group exceeded, met, or fell short of expected growth.

The legend at the bottom of the report provides guidance for interpreting the colors.

ColorGrowth Index Compared to Expected GrowthInterpretation
Level 5

At least 2 standard errors above

Significant evidence that the group of students exceeded expected growth

Level 4

Between 1 and 2 standard errors above

Moderate evidence that the teacher's students made more progress than expected growth

Level 3

Between 1 standard error above and 1 standard error below

Evidence that the teacher's students made progress similar to expected growth

Level 2

Between 1 and 2 standard errors below

Moderate evidence that the group of students did not meet expected growth

Level 1

More than 2 standard errors below

Significant evidence that the group of students did not meet expected growth

When a growth index falls exactly on the boundary between two colors, the higher effectiveness level is assigned.