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The estimation procedure provides person ability estimates which are independent of the items employed in the assessment, and conversely estimates item locations independently from the sample of test users (or patients) employed.
The next step was introduction of the logistic risk function, as initially proposed by Cornfield et al. (9), for estimation of mutually adjusted predictive ability estimates of the probability of developing a disease according to risk factors.
The precision of the person ability estimates was represented by the expected a posteriori (EAP) estimation of 0.71, which showed, as expected, a good match with Cronbach's alpha.
Person ability estimates were normally distributed and centered around 1.00.
The scores were analysed using the FACETS to account for ability estimates and item difficulty.
Therefore, the candidate ability estimates differed significantly in both test modes.
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The ability estimate mean for all the test-takers was 1.61.
Roussos (1996) developed CATSIB a modified version of SIBTEST that uses an examinee's ability estimate as the conditioning variable.
〈nd〉 is higher than hrd for the SNPL due to the higher local dispersal ability estimated from recent surveys (Himes et al. 2006; Pruner 2010).
Therefore, a higher person ability estimate could be expected for person B than for person A. This is possible because person ability scores and item difficulty values are located on an interval scale with a common metric (Smith [2000]).
In Rasch models, each ability estimate has an associated standard error of measurement (SEM).
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