Global ETD Search
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Showing 1 to 7 of 7 for “"Parameter drift"”.
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Item parameter drift and online calibration
… based computerized adaptive assessment is item parameter invariance. Sometimes, however, item parameters are not invariant across different test administrations due to factors other than sampling error; and this phenomenon is termed item parameter drift. Several methods have been developed to …
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A stepwise test characteristic curve method to detect item parameter drift
… theory (IRT) based equating is that the item parameters should be invariant over different testing occasions. Sometimes, however, item parameters do not remain invariant due to factors other than sampling error, and this is termed item parameter drift (IPD). Several methods have been proposed …
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Student-Group Item Parameter Drift Impact on Individual and Aggregate Observed Scores
… research into the impact of student-group item parameterdrift (SIPD) —referred to as subpopulation item parameter drift in previous research— on abilityestimates and proficiency classification accuracy when occurring in the discrimination parameterof a 2-PL item response theory (IRT) model. …
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Fault Detection for Systems with Multiple Unknown Modes and Similar Units
… a common Gaussian-mixture distribution for unit parameters whereby observations are mapped into a common parameter-space and clusters are then identified corresponding to different modes of operation via the Expectation- Maximization algorithm. The estimated common distribution incorporates and …
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Model reference adaptive control for one dof hand rehabilitation robot
… Besides that, DC motor has variations in its parameters during operation and it also sensitive to disturbances, presence load and environment. Therefore, it may require an advance technique to make the DC motor position stable. Many different types of controllers were used to provide the …
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DEVELOPMENT OF ADAPTIVE ROBUST SCHEMES FOR NONLINEAR UNCERTAIN SYSTEMS
… as u-modification scheme, is proposed to clamp parameter adaptation in accordance with the adaptive robust control law. The novel property possessed by the new control scheme is that it guarantees the uniform boundedness of the system and at the same time, the tracking error enters an …