July 28, 2017

Q&A – Slope for standard scores


Great question from Lavonne:

My question is similar to that of Jen on July 18, 2011. I am wondering if Rate of Improvement can be graphed and slope comparisons used with standard scores such as those generated by STAR Reading. We also have standard scores on our statewide assessments and could easily generate Excel graphs to show the difference between our student’s performance and that reuqired to pass. We can easily generate our own Excel graphs, we just want to make sure the data is valid.Thank you.

P.S. Thanks so much for this site!

My response:

You can calculate slope for scores that have an equal interval between data points.  STAR Reading, STAR Math, and STAR Early Literacy is a good example of non-CBM data and has been validated as a data set for which you can calculate slope.  Joe Kovaleski and colleagues (2013) just published a book that describes using rate of improvement with computer adaptive tests (CATs), specifically with STAR assessments. I highly recommend getting a copy!

Kovaleski, J. F., VanDerHeyden, A. M., & Shapiro, E. S. (2013). The RTI approach to evaluating learning disabilities. New York, NY; Guilford Press.


Calculating RoI for non-CBM

We’re starting this Q&A section with a great question submitted by Jen on 2011/07/15 at 2:57 pm as a comment on the following post:


I am in charge of RtI for our district and this year we are going from use of AIMSWeb, which made this simple, to use of DRA and Fountes and Pinnell Benchmark Assessment System. These systems, unlike AIMSWeb, only offer guided reading levels, but will not be helpful in progress monitoring more frequently unless we can determine a productive rate of improvement. We are looking to have our students gain 1.5 years in 1.0 year. Any thoughts on how we can create a formula for this for teachers to use so they aren’t just guessing. DRA and F& P by the way do not go by 1 level at a time but more like 2, 4, 6 and they are not the same. I was thinking to look at 1.5 years ahead of whereever the student is currently at and expect that for the entire year and then break that down by the # of weeks in the year to determine where the student should be at each week.

Your thoughts?

We also wanted to figure out a way to calculate in the strategies expected at those levels, such as this book level, but also this many (2) strategies every 2 weeks.

Again, your thoughts?

Thank SO much!
Glad I found this site!