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The item is set to (-1) in the index array.
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As we've only just witnessed Trump's inauguration this morning, all the items are set to gray at the start.
By Christmas 2015 the items are set to be available for purchase online, too.
The items are set to fetch hundreds of thousands of dollars, if not millions, much of which will go toward science.
In the present study, the time window for each item was set to the previous week in order to correlate with the time window in the GSRS and the PGWB.
To identify the models, the procedure suggested by Yoon & Millsap [ 66] was used: For testing configural invariance, the factor loadings of one indicator item was set to 1 (the same item in all groups) and the mean of the latent variable was fixed to zero in all groups.
To estimate item parameters for the Legacy HAQ-DI and PF-10 items, PROMIS items that were similar to the Legacy items were set to missing.
In addition, item error variances and error covariances between related items were set to vary freely.
Since the slope parameters after the switching point are set to zero, the item responses do not depend on the person variable, (tilde{uptheta }_{p}), meaning that the person variable underlying aberrant response behavior is not defined.
As item and person parameters are estimated separately and the mean item difficulty is set to 0 by default, a mean person ability of -.20 indicates that most respondents solved less than half of the items.
To test for scalar invariance, the intercepts of the items were set equal over the countries.
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