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If they are located above the item location, the likelihood of answering the item correctly increases.
Whereas infit is affected by unexpected response patterns of subjects located near the item position on the scale, outfit is more sensitive to unexpected response patterns of subjects located far from the item location.
Both person ability and item location (estimated in terms of log-odds or "logits") are located along the same continuum.
The relative difficulties among items can be examined in terms of the average item location parameters.
We analyzed model-data fit, person and item location along the support latent variable and differential person and item functioning.
Similar to item difficulty parameters, high values of item location estimates indicate that the item is harder than others.
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The person-item location distributions demonstrated that the ASQOL items targeted the respondents relatively well (data not shown).
This was analyzed by plotting the person-item location threshold distribution graph with distributions of persons on the top half of the graph and item thresholds at the bottom half of the graph.
Furthermore, the PREE was shown to be well-targeted with a person-item location slightly less than the average of zero logits, which discounts item difficulty as a problem (See Fig. 2).
Ocean Conservancy collects that data and publishes it every year in our Ocean Trash Index, the only item-by-item, location-by-location accounting of what's trashing our ocean.
The logit and person coverage of the ASQOL was examined using the item-location and person-location distribution maps.
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