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The item-person map, where the item difficulties and person measures were plotted together along the same logit scale, is useful for visual inspection to identify areas or gaps along the latent trait continuum that may be lacking items.
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Differential item functioning (DIF), referred to as an item lacking item parameter or measurement equivalence across different groups or settings, was identified statistically by conducting the t-tests on the mean item calibrations between the 3 assessment time groups (T0 vs. T1 vs. T2).
They lack items with a broad enough range to adequately measure the extremes.
All negatively rated questionnaires lack items assessing the domestic life chapter of the ICF (i.e., IADL).
However, the PDI items did not comprehensively reflect the construct of dignity, because the PDI lacks items about communication and care characteristics.
Differences were more pronounced at the higher function/less pain end of the scales, where WOMAC lacked item coverage.
Fifty-eight items were left out in the HAQ questionnaire (58 of 20 × 119 = 2%) and in the AIMS2 70 items were lacking (70 items of 20 × 119 = 3%).
As a standardised method for surveying opinions about khat is lacking, the items were constructed from hypotheses stated in the pertinent literature [ 1, 3, 8, 12, 13, 15, 22- 27] and popular beliefs.
Is it lacking in items that might entice your husband into it more often?
We removed items with low response rates and items lacking strong correlations with other items (described in detail in Results).
Think about the percentage of clothes you have and it will show you where you are lack items.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com