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Rasch models [ 28] are latent trait models estimating person ability (or person measure), and item difficulty along a single continuum.
(1) Rasch transformed scores in each domain will be generated by separately estimating person measures using the Excel module which was incorporated with WINSTEPS software to easily estimate the individual measures.
Adjusting the scale for guessing, and then estimating person proficiencies based on all responses of each student, provides a stronger linearisation of the total scores than an original analysis.
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The subcohort for estimating person-years of risk was randomly selected from the eligible participants without a previous diagnosis of CHD at the time of initial enrollment.
Multilog was used to estimate person location (θ, reflecting participants' perceived risk) using maximum a posteriori (MAP) estimation.
In the second stage, we treated the item category intercept estimates as known and estimated person- and country-level parameters related to the latent traits.
These individuals have been followed-up biennially from baseline in 1986 for migration and vital status to estimate person time at risk for the entire cohort.
Next we examined whether there are differences in the measurement error surrounding estimated person scores.
First, the estimated person location was the only predictor in the logistic regression model.
The clinical significance of any observed DIF was studied by assessing if DIF influenced the estimated person locations (logit measures).
This is well in excess of the all industry rate of 2.3 claims per 100 estimated person years of employment.
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