# Conditional Score Averages Model

Growth can be described in a normative fashion by considering the average of test score 2 for each value of test score 1. These averages are known as conditional score averages. If students exceed the conditional score average, they performed better on test 2 than their peers with the same score on test 1. The conditional score averages are useful for predicting scores in a future grade and for measuring student growth relative to peers with the same prior test scores.

Below, we provide conditional score averages for numerous pairs of assessments. Find the assessment pair and select the growth period you are interested in to download the conditional score averages and 50% score prediction intervals.

Test 1Test 2Growth Period
ACT ExploreACT ExploreGrade 8 to grade 9 (10–14 months)
ACT ExploreACT PlanGrade 8 to grade 10
ACT ExploreACTGrade 8 to grade 11
ACT ExploreACT PlanGrade 9 to grade 10 (10–14 months)
ACT Explore EnglishACT QualityCore English 96–12 months
ACT Explore MathematicsACT QualityCore Algebra I6–12 months
ACT Explore MathematicsACT QualityCore Geometry6–12 months
ACT Explore ScienceACT QualityCore Biology6–12 months
ACT Explore EnglishACT QualityCore English 1018–24 months
ACT Explore MathematicsACT QualityCore Geometry18–24 months
ACT Explore ScienceACT QualityCore Biology18–24 months
ACT PlanACT PlanGrade 9 to grade 10 (10–14 months)
ACT PlanACTGrade 10 to grade 11 (10–14 months)
ACT PlanACTFall grade 10 to spring grade 11
ACT Plan EnglishACT QualityCore English 106–12 months
ACT Plan MathematicsACT QualityCore Geometry6–12 months
ACT Plan MathematicsACT QualityCore Algebra II6–12 months
ACT Plan ScienceACT QualityCore Biology6–12 months
ACT Plan ReadingACT QualityCore US History6–12 months
ACT Plan EnglishACT QualityCore English 1118–24 months
ACT Plan MathematicsACT QualityCore Geometry18–24 months
ACT Plan MathematicsACT QualityCore Algebra II18–24 months
ACT Plan MathematicsACT QualityCore Pre-Calculus18–24 months
ACT Plan ReadingACT QualityCore U.S. History18–24 months
ACT Plan ScienceACT QualityCore Chemistry18–24 months
ACT QualityCore English 9ACT QualityCore English 1010–14 months
ACT QualityCore English 10ACT QualityCore English 1110–14 months
ACT QualityCore English 11ACT QualityCore English 1210–14 months
ACT QualityCore Algebra IACT QualityCore Algebra II22–26 months
ACT EnglishACT Compass Writing Skills10–14 months
ACT MathematicsACT Compass Pre-Algebra10–14 months
ACT MathematicsACT Compass Algebra10–14 months
ACT MathematicsACT Compass College Algebra10–14 months
ACT ReadingACT Compass Reading Skills10–14 months

### How to Apply the Conditional Score Averages

In this example, 124 students took the ACT Explore assessment in 9th grade and then took the ACT Plan assessment in 10th grade, 12 months later. Students’ predicted ACT Plan scores are determined by their ACT Explore score in the same subject area using the Conditional Score Average model.

Predicted ACT Plan scores can be compared to actual ACT Plan scores to obtain residual scores that measure growth relative to peers. The predicted values and residual scores are highlighted in the spreadsheet.

The worksheet titled “Conditional Score Averages” is obtained from the ACT Explore/ACT Plan/Grade 9 to grade 10 (10–14 months) row in the table above.