The phrase "ability of the items" is correct and usable in written English.
It can be used when discussing the capabilities or functionalities of specific items or objects in a particular context.
Example: "The ability of the items to withstand extreme temperatures makes them ideal for outdoor use."
Alternatives: "capability of the items" or "functionality of the items".
Following the marking of the multiple choice tests, the participants' option selections were analysed and comparisons were conducted of the validity, reliability and difficulty of the three different option format tests as well as the discrimination ability of the items in their those option formats.
23 Further analysis of the discriminative ability of the items is suggested.
All other items correlated modestly to well with the sum of the other items in their scale; Pearson's r>0.30 confirmed good discriminative ability of the items.
Internal consistency (the ability of the items to assess the underlying construct) (Taylor and Ranse 2011), where applicable, has been considered.
Rasch analysis allowed a detailed assessment of the suitability of the response format, fit of each of the items, and the ability of the items to form a coherent set of subscales.
The difference between the top two levels in CASP control and autonomy subscale scores for each attribute provides good evidence of the ability of the items to capture choice.
It ranges from -1 to 1; the closer the index to |1|, the higher the ability of the item to discriminate between those who scored high on the total test and those who scored low.
The typical violation of one of the Rasch model preconditions, namely the relevant discrepancy between the patient's condition and ability of the item to describe it (severity), provides evidence that the items used were not suitable for the Rasch analysis.
The frequency distributions of the patients' assessed levels of problem with the FB(2.0) items joint mobility and of walking were similar with the same median and third quartiles, moderate and major problems, respectively, but the paired distribution of the assessments shows the discriminating ability of these items, Figure 4.
Despite the widespread use of self-assessments of overall health among military personnel, research is lacking regarding the ability of these items to predict health status among this relatively young, healthy population.
This would dilute our samples and decrease the predictive and diagnostic ability of the investigated items.
