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Full cohort analysis and MI provided similar predictive abilities estimates when the imputation model was correctly specified or when the phase-2 variable had no effect on the studied risk.
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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.
Again, plausible values were obtained as person ability estimates and reliabilities were good (range: 0.83 – 0.83).
The variance of person ability estimates [1.22 logits] and the test reliability of 0.75 were satisfactory.
So the presence of item bias could exert a stronger effect on the ability estimates of the examinees.
However, this choice coerces the students' ability estimates on the two dimensions so that both have an average of zero.
・Person ability estimates in relation to can-do item difficulty estimates Decision ・The test score is appropirate for making placement decisions and useful for test-takers' further learning.
Ability estimates provided by Rasch analysis of the FIM motor scale were a more accurate indication of ability than raw scores.
Because our analyses were focused on the comparison of items, we constrained the cases (i.e., the students) so that the average ability estimates would be zero.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com