
Spelling Curriculum Based Measurement
A representative portion of a larger population selected for studying the characteristics of the larger population. A mathematical transformation of a raw score that allows for direct comparisons of scores earned by a student across subtests on a common interval scale. Scaled scores are also converted into other useful derived scores that describe a students test performance.
Obtained from the OtisLennon School Ability Test(published by Harcourt), the SAI is a normalized scaled score with a mean of 100 and a standard deviation of 16.
An AIMSweb School User type; the School Manager can edit and view data for every classroom and student within the designated school.
A measure of the variability or dispersion (i.e., spread) of a normal distribution of scores. When scores are clustered closely around the mean (middle) of a distribution, the SD is low. When larger numbers of very low and very high scores cause the distribution to be more spread out, the SD is high.
The amount by which a students observed score is expected to fluctuate around the students true score. A test having a low SEM means that the students observed score is not expected to differ greatly from the students true score.
The process of administering the same test (or equivalent forms of the test) to a large reference population under uniform conditions. Standardization also includes applying uniform scoring methods and score interpretations. During the norming or administration of a test, standardization ensures that all scores have the same meaning. This is important when comparisons are made between scores across subtests or between groups of students.
See reference population.
See criterionreferenced test.
Stanines, like percentile ranks, indicate a students relative standing when compared to a reference population. Stanines range from a low of 1 to a high of 9, with a 5 designating average performance and a standard deviation of 2. In contrast to percentile ranks, stanines represent approximately equal units of achievement. For example, the difference between stanines 2 and 4 represents about the same difference in achievement as the difference between stanines 5 and 7. Stanines are particularly useful for comparing or profiling a students scores across subtests.
An AIMSweb District User type. The Superintendent User can view data for every school within the assigned district.
