9th grade norms sometimes higher than 10th grade norms

Document created by Community User on Aug 1, 2017
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In the 2015 MAP Growth Comparative Data to Inform Instructional Decisions document, there are some places where the RIT score for a particular achievement level for 9th grade is higher than the comparable score for 10th grade. Why is this?

We would expect that the distribution of scores for a higher grade would be generally higher than the previous grade, and the norms are generally consistent with this expectation, except for the lower portions of the distributions for grades 9 and 10.

While we do not know the exact cause of this exception, we suspect that this is a matter of the pools of test records available to be sampled. We do not know whether the practice of testing all students in a grade is always followed by organizations testing high school students.

In these grades, testing with MAP Growth tests serves multiple purposes, and those purposes may not require administering the test to all students. Not testing all or nearly all students in a grade affects the population of test records in those grades, thereby affecting the sampling of those records. When we compare the test results from these grades to those from grades in which nearly all students were tested, unexpected patterns of distributions can occur. The comparative data tables exhibit such oddity for lower performing students in grades 9 and 10.

More research would be needed, however, to determine the exact cause of these unexpected distributions.

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