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The Irrelevance of Vertical Scales to Understanding Student Growth
“It is a common misconception that to measure student
growth in education, the subject matter and grades over
which growth is examined must be on the same scale—referred
to as a vertical scale. Not only is a vertical scale not
necessary, but its existence obscures fundamental concepts
necessary to understand growth.” (Betebenner, 2009)
In many recent discussions with SBAC states, there has been common
opinion expressed that having the vertical scale associated with
the SBAC test will obviate the need for a growth model. These
states did not have a vertical scale on their previous state tests
and under the belief that with the vertical scale, gain scores
will provide them with a viable "growth model".
References
Betebenner, D. W. (2009). Norm- and criterion-referenced student growth.
Educational Measurement: Issues and Practice, 28(4):42-51.