Rasch Model

Rasch Model

Rasch models are used for analysing data from assessments to measure variables such as abilities, attitudes, and personality traits. For example, they may be used to estimate a student's reading ability from answers to questions on a reading assessment, or the extremity of a person's attitude to capital punishment from responses on a questionnaire.

Rasch models are particularly used in psychometrics, the field concerned with the theory and technique of psychological and educational measurement. In addition, they are increasingly being used in other areas, including the health profession and market research because of their general applicability.

The mathematical theory underlying Rasch models is in some respects the same as item response theory. However, proponents of Rasch models argue it has a specific property that provides a criterion for successful measurement. Application of the models provides diagnostic information regarding how well the criterion is met. Application of the models can also provide information about how well items or questions on assessments work to measure the ability or trait. Prominent advocates of Rasch models include Benjamin Drake Wright, David Andrich and Erling Andersen.

Read more about Rasch Model:  Features of The Rasch Model, The Mathematical Form of The Rasch Model For Dichotomous Data, The Polytomous Form of The Rasch Model, Other Considerations, References and Further Reading

Other articles related to "rasch model, model, rasch, models":

Polytomous Rasch Model
... The polytomous Rasch model is generalization of the dichotomous Rasch model ... It 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, rating scales, and to educational assessment items for which successively higher integer scores ...
Rasch Model - References and Further Reading
... Applied Rasch Measurement A book of exemplars ... Sufficient statistics and latent trait models, Psychometrika, 42, 69–81 ... Relationships between the Thurstone and Rasch approaches to item scaling ...
Law Of Comparative Judgment - Case 5 of The Law of Comparative Judgment
... five particular cases of the 'law', or measurement model ... An important case of the model is Case 5, in which the discriminal dispersions are specified to be uniform and uncorrelated ... This form of the model can be represented as follows where In this case of the model, the difference can be inferred directly from the proportion of instances in which j is ...
Polytomous Rasch Model - Background and Overview
... The polytomous Rasch model was derived by Andrich (1978), subsequent to derivations by Rasch (1961) and Andersen (1977), through resolution of relevant ... When the model was derived, Andrich focused on the use of Likert scales in psychometrics, both for illustrative purposes and to aid in the interpretation of the model ... The model is sometimes referred to as the Rating Scale Model when (i) items have the same number of thresholds and (ii) in turn, the difference between any given threshold location and the ...

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