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By Fearn T., Brown P.J., Besbeas P.

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The same general warrant is employed, as adapted to the particulars of each piece of data as they fit into the same scheme. p(γ) γ p(X1|γ) p(X3|γ) p(X2 |γ) X1 X2 X3 Fig. 5. Graph for an item response theory (IRT) model There is an important difference between the variables in a probability model and the corresponding entities, claims, and data in a Toulmin diagram. 20 Robert Mislevy and Chun-Wei Huang A claim in a Toulmin diagram is a particular proposition that one seeks to support; a datum is a particular proposition about an aspect of an observation.

It is compelling to examine the items that differentiate the groups. Is it that background knowledge differs among different groups of people? Are different people using different strategies to solve items? 3. It may be found that the RM fits well within the classes determined by partitioning persons and responses on the basis of w. In these circumstances one again obtains measurement models in the sense of probabilistic versions of conjoint measurement. 2 Mixtures of Rasch Models The not-uncommon finding of DIF among manifest groups raises the possibility that this phenomenon may be occurring even when the analyst does not happen to know persons’ values on the appropriate grouping variable.

Then, in the last section before the discussion section, it will be shown how the basic idea of the LM test can be generalized to a Bayesian framework. 4 An LM Test for Person Fit Smith (1985, 1986) introduced a Pearson-type test statistic for the RM for evaluating the constancy of the ability parameter across subtests. To perform the test, the set of test items is divided into S nonoverlapping subtests denoted by As (s = 1, . . , S). 6) UB = S − 1 s=1 i∈As Pi (θv ) [1 − Pi (θv )] where Pi (θv ) is the probability of a correct response in the RM.

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A Bayesian decision theory approach to variable selection for discrimination by Fearn T., Brown P.J., Besbeas P.

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