What are the differences in scoring Curriculum Sampling and Domain-based CBM probes?

Curriculum Sampling probes are scored using the Universal Screener Scaled Scores and Domain-based probes are scored using percentages.

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Scoring of Domain-based Probes

1. Baseline Determined: The median of the student's first three probes determines the starting point 
   

1. Target Rate of Improvement: This is determined by the type of goal the teacher selected  In this example the teacher selected an Aggressive goal
   
1. Moderate - 70% goal by the end of 12 weeks

1. Aggressive - 80% goal by the end of 12 weeks

Read more about the difference between moderate and aggressive goals with Domain-based probes

1. Moderate/Aggressive ROI: Classworks calculates the trend line using an ordinary least squares regression equation. (A constant slope from baseline to the goal)
   

1. Student Rate of Improvement:  How many percentage points the student needs to improve weekly to reach the 12-week goal
   

Scoring of Curriculum Sampling Probes

1. Baseline Determined: The median of the student's first three probes determines the starting point 
   

In this example the median of the first 3 probes was 220 That is where the green (Target Rate of Improvement) and yellow (student's actual Rate of Improvement) lines begin.

1. Target Rate of Improvement: This is determined by the type of goal the teacher selected  In this example the teacher selected a Moderate goal
   
1. Moderate - Score at or above the next assessment target (Make 18 weeks of growth in 12 weeks)

1. Aggressive - Score at or above the second next assessment target (Make 36 weeks of growth in 12 weeks)

Read more about the difference between Moderate and Aggressive goals with Curriculum Sampling probes

1. Moderate/Aggressive ROI: Classworks calculates the trend line using an ordinary least squares regression equation. (A constant slope from baseline to the goal)
   

In this example the Target Rate of Improvement is a constant sloped line from 220 (the child's baseline) and 240 the Moderate Goal. The student needs to improve 0.9091 each week to reach this goal.

1. Student Rate of Improvement:  How many percentage points the student needs to improve weekly to reach the 12-week goal
   

In this example the student is currently improving their weekly score by an average of 3.3631. The student is performing on target to reach their goal.