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Assuming the frequency of HCV-RNA-positive individuals among the estimated persons ever infected in the present study, it would be expected that there were approximately 158,000 (122,000 to 196,000) patients infected with HCV.
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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.
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.
We estimated person-years based on the number of residents in each eligible ZIP code during each year for 1993 2008.
Then the available items are scanned in order to determine which item could improve the estimated person location.
The Rasch measurement error for person scores is a function of the number of items and the targeting of each item's difficulty to the estimated person ability.
The outfit statistic is sensitive to anomalous outliers for either person or item parameters, whereas the infit statistic is sensitive to residuals close to the estimated person abilities.
In other words, the CAT was stopped when the 95% Confidence Interval of the estimated person location did no longer overlap with the chosen cut-off point.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com