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Lockwood, J. R.; Castellano, Katherine E. – Educational and Psychological Measurement, 2017
Student Growth Percentiles (SGPs) increasingly are being used in the United States for inferences about student achievement growth and educator effectiveness. Emerging research has indicated that SGPs estimated from observed test scores have large measurement errors. As such, little is known about "true" SGPs, which are defined in terms…
Descriptors: Item Response Theory, Correlation, Student Characteristics, Academic Achievement
Konstantopoulos, Spyros; Li, Wei; Miller, Shazia R.; van der Ploeg, Arie – Educational and Psychological Measurement, 2016
We use data from a large-scale experiment conducted in Indiana in 2009-2010 to examine the impact of two interim assessment programs (mCLASS and Acuity) across the mathematics and reading achievement distributions. Specifically, we focus on whether the use of interim assessments has a particularly strong effect on improving outcomes for low…
Descriptors: Educational Assessment, Mathematics Achievement, Reading Achievement, Regression (Statistics)
Ye, Meng; Xin, Tao – Educational and Psychological Measurement, 2014
The authors explored the effects of drifting common items on vertical scaling within the higher order framework of item parameter drift (IPD). The results showed that if IPD occurred between a pair of test levels, the scaling performance started to deviate from the ideal state, as indicated by bias of scaling. When there were two items drifting…
Descriptors: Scaling, Test Items, Equated Scores, Achievement Gains
Humphry, Stephen M. – Educational and Psychological Measurement, 2010
Discrimination has traditionally been parameterized for items but not other empirical factors. Consequently, if person factors affect discrimination they cause misfit. However, by explicitly formulating the relationship between discrimination and the unit of a metric, it is possible to parameterize discrimination for person groups. This article…
Descriptors: Discriminant Analysis, Models, Simulation, Reading Tests
Wang, Shudong; Jiao, Hong – Educational and Psychological Measurement, 2009
In practice, vertical scales have been continually used to measure students' achievement progress across several grade levels and have been considered very challenging psychometric procedures. Recently, such practices have been drawing many criticisms. The major criticisms focus on dimensionality and construct equivalence of the latent trait or…
Descriptors: Reading Comprehension, Elementary Secondary Education, Measures (Individuals), Psychometrics