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This leads to highly varied item n's for calculating discrepancy scores.
Unlike the first three models summarized above, this model allows the effect of item position on each item to vary across items.
Spearman's correlations between scales and their items varied between 0.416 (item 8) and 0.668 (item 3) for the GOHAI and 0.690 (item 8) and 0.807 (item 11) for the OHIP-14.
Unlike the RSM, the number of response categories in the GRM is free to vary across items, and item discrimination parameters are not constant.
The threshold distances vary across items (see varying lengths of category one across items), supporting the use of the partial credit model for the analysis of this scale.
In our regression analysis, these values vary from item to item depending on the predictor variables.
First, a two-parameter logistic model (2PL) was fitted in which the slope, or discrimination parameter, of the item characteristic curves was allowed to vary between items [ 15].
Internal reliability of scales for each single item removed varied between 0.873 (item 11) and 0.896 (item 8) for the GOHAI and 0.954 (item 9,11) and 0. 957 (item 2) for the OHIP-14.
The a parameters may be constrained to be equal or vary across items.
3 Scaling model 3 discrimination parameter are constant across countries but vary over items.
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