The Composite Score is the collective raw scores of multiple subtests transformed by a combination of statistical and psychometric methods designed to maximize predictive validity and provide comparability of scores across seasons. This article provides an overview of what a Composite Score means in FastBridge and where it can be found.

## Overview

FastBridge uses the following calculations to determine the Composite Score. The first weight uses a vertical scale score to adjust the raw score so that all subtests have equivalent predictive estimates of the underlying skill (i.e., reading and math). The second weight uses a factor loading from a factor analysis for each subtest to estimate growth across screening periods. Thus, the total Composite Score for a screening period combines these weights such that:

**Total Composite Score** = Raw Scorest1 * (Vertical Scale Score st1) * (Factor Loading st1) +

*Raw Score st2 * (Vertical Scale Score st2) * (Factor Loading st2) + … +*

*Raw Score stn * (Vertical Scale Score stn) * (Factor Loading stn) *

Next, the total composite score in each season is transformed to a scale with a mean of 50 and a standard deviation of 15. This linear transformation results in the final composite score.

**Final composite score** = Total Composite Score * 15/SDsample + [50 - 15/SDsample + Msample]

The combined weights and linear transformation on the raw score provide a more accurate picture for educators to estimate students’ strengths in early reading and math competencies and growth across screening periods. Take a look at Development of earlyReading and earlyMath Composite Score and Explanation of earlyReading and earlyMath Composite Score to learn more.

Scores can only be assigned at one school site. Scores should transfer automatically with a student to a new school site. In the event they do not, please contact support.

## Assessments

A Composite Score can be found in the following assessments:

## Reports

A Composite Score can be found in the following reports:

- Group Screening Report