At Tutors for All, we frequently reference our students’ MSGP (median student growth percentile). In order to understand the progress that our students make, it is important to understand what MSGP is.
According to the Massachusetts Department of Elementary and Secondary Education’s “MCAS Student Growth Percentiles: Interpretive Guide”:
A student growth percentile measures student progress by comparing one student’s progress to the progress of other students with similar MCAS performance histories. We refer to students with similar score histories as “academic peers.” (p.1)
…Because growth is measuring change in performance rather than absolute performance, it doesn’t matter how a student performed on the MCAS last year. In any given testing year, each student has an equal opportunity to grow at the 99th percentile. In other words, even though a student may not achieve a score of 278 out of 280 this year, it is possible for a student to have grown at the 99th percentile from last year to this year. Although a student may perform well below the proficiency mark, that student could potentially have a high growth percentile. Such an occurrence could indicate that a program, a new approach, or something else is working for this student.(p.2)
…The most appropriate measure for reporting growth for a group is the median student growth percentile (the middle score if one ranks the individual student growth percentiles from highest to lowest). The average or mean is not an appropriate measure when comparing percentiles. A typical school or district in the Commonwealth would have a median student growth percentile of 50. (p.3) (Chester, 2011)
So in the context of our 2012 MCAS in Math results, our students from the Maurice Tobin K-8 school achieved an MSGP of 87, while un-served students earned an MSGP of 61 and comparative 6th graders in Boston Public Schools had an MSGP of 54.
Chester, M.D. (2011). MCAS Student Growth Percentiles: Interpretive Guide. Retrieved from http://www.doe.mass.edu/mcas/growth/InterpretiveGuide.pdf