Student
growth percentiles allow us to look at student performance over time, relative
to peers. SGP's are a number ranging from 1 through 99, with the higher the number
meaning better performance. NJDOE recommends that student growth should be
between the 35th and the 65th percentile, for average
growth. Student growth percentile is calculated by comparing a student’s
achievement that of his academic peers. Furthermore, academic peers are
students throughout the state with similar test score histories. For instance,
in the state of New Jersey students with similar NJASK test score histories are considered academic peers. Student growth percentiles do
not take into account for any demographic factors such as gender or ethnicity,
or specific programs such as English language learners or students with
disabilities when identifying academic peers. However, academic peers are
in the same grade, took the same tests (such as the NJASK), and have achieved
similar results on past tests.
Furthermore,
student growth percentiles look at how similar students change to find what
typical growth is for a group of students. It allows us to find students who
are making fast/more progress and students who are making slower/less progress.
From there, it also allows us to investigate what is and isn’t working for
students.
Over
the years states may change their tests, resulting in the question, “Can we
still compare test scores across years if the tests change?” The answer is yes.
Luckily, student growth percentiles do not require identical tests or scales
every year. This is because they measure normative growth, meaning that
students are being compared tot heir academic peers taking the same assessment
making the calculation reliable.
It
has been proposed by NJ Department of Education officials that the New Jersey
Student Growth Percentile measures to be used for evaluating teachers and
principals and rating local public schools. The NJDOE proposed tat NJ student
growth percentiles be used as a major component for determining teacher effectiveness
as well, having consequences for employment if rating are low. It has been
revealed that Student Growth Percentiles are “not designed for inferring
teacher influence on student outcomes,” they “do not control for various
factors outside of the teacher’s control,” they’re “not backed by research on
estimating teacher effectiveness. By contrast, research on SGPs has shown them
to be poor at isolating teacher influence,” and NJ SGP measures, “at the school
level, are significantly statistically biased with respect to student
population characteristics and average performance level.”
“Using
Student Growth Percentiles,” NJ Smart Education Data System.
http://survey.pcgus.com/njgrowth/player.html
State
of Washington OSPI. http://www.k12.wa.us/assessment/SGP/FAQ.aspx#1
Deconstructing
Disinformation on Student Growth Percentiles & Teacher Evaluation in New
Jersey. Student Finance 101.
http://schoolfinance101.wordpress.com/2013/05/02/deconstructing-disinformation-on-student-growth-percentiles-teacher-evaluation-in-new-jersey/
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