Rate of Improvement Score (ROI)
The Rate of Improvement (ROI) score can be found in the downloadable .CSV files that are available once you’ve begun testing students. We simply calculate ROI based on the individual students performance over time.
Calculating ROI
The ROI used for easyCBM is calculated based on the formula mandated by the state of TN (where teachers must provide ROI information for every student being progress monitored / provided Tier 3 instruction). It is not a linear regression method.
The formula is fairly simple. We subtract the students’ most recent "prior" score from their current score, and then divide by the number of days in between the two scores. As a student takes additional assessments, the ROI is updated to reflect the change over time (‘rate’) from one assessment to the next.
The Rate of Improvement is a simple computation based on change in score / number of days between testing sessions. When developing "Instructional Goals", we encourage you to refer to the national norms, and to set goals based on students meeting or exceeding the 50th percentile.
The raw score associated with the 50th percentile varies by measure and season, using the percentile lines displayed on the Individual Reports can provide reference as well.
How many data points and what type do I need to calculate ROI?
To get an estimate of an individual student’s rate of improvement you need at least three data points to calculate “slope” of “change over time”, which is the basic formula for “rate of improvement”.
The three data points can be a fall benchmark and then two progress monitoring measures or three progress monitoring measures — all of the same measure type — (ideally administered far enough apart so that the student might be expected to show some improvement (a minimum of 2 weeks for the basic literacy measures such as LN, LS, SEG, WRF, PRF and a minimum of 3 weeks for the more challenging constructs such as math, vocabulary, and reading comprehension).
Once a student has taken three different tests of the same test type and grade level, the system will automatically calculate that individual student’s rate of improvement (increase in score per day), which you can access by downloading a .CSV of the report.
Export CSV file for ROI Calculation
To export data, login to your easyCBM Dashboard and click on the Reports tab.
Next, click on the Groups tab.
To the right of each group name, click on the "Export CSV" link to download the file.
For more details on setting goals, please see: Setting and Entering Student Goals