Objective Measurement

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Polytomous Rasch model - The polytomous Rasch model is a measurement model that has potential application in any context in which the objective is to measure a trait or ability through a process in which responses to items are scored with successive integers. For example, the model is applicable to the use of Likert Scales, and to educational assessment items for which successively higher ...

Quantum darwinism - Quantum darwinism is the name given to a theorem published in 2004 by Harold, Poulin, and Zurek, which attempts to explain how the objective reality we see arises from the quantum mechanical world. During a measurement process, a phenomenon called quantum decoherence takes place: the system tends to evolve into stable states known as "pointer states", which have the properties of a classical mechanical state (for example, possessing a well-defined position.

Automated refractor - An automated refractor, or autorefractor, is a computer-controlled machine used during an eye examination to provide an objective measurement of a person's refractive error and prescription for glasses or contact lenses. This is achieved by measuring how light is changed as it enters a person's eye.

Retinoscopy - Retinoscopy is a technique to obtain an objective measurement of the refractive condition of a patient's eye. The examiner uses a retinoscope to shine light into the patient's eye and observes the reflection (reflex) off the patient's retina.


Suggested Web Sites

Laser Micrometer - Laser based measurement devices with 7 micron resolution capable of measuring diameter, gap between objects, height, width, profile of objects, vibration, position, centering and threshold.

Institute for Objective Measurement (IOM) - Seeks to bring understanding to psychological and educational measurement in the human sciences. Provides information on certification program, publications, workshops, and Rasch measurement.

Variability of Exchanges In the Northern Seas (VEINS). - The overall objective of VEINS was to measure and to model the variability of the fluxes between the Arctic Ocean and the Atlantic Ocean with a view on implementing a longer term system of critical measurements needed to understand the high-latitude oceans steering role in decadal climate variability.

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