Exact(1)
In fact, according to the progress bar in my game, I'm less than 20percentt of the way through the story, with even less completed of the challenges and the Compendium (index of items discovered/found).
Similar(59)
For integer keys, we can use key as the index of item in linear array and we can get item from key very simple without storing keys.
The psychometric properties were explored with an index of item objective congruence (IOC), Pearson correlation, second-order confirmatory factor analysis and Cronbach's alpha coefficient to estimate the quantitative data.
For items with an RT threshold identified, a dichotomous index of item solution behavior (SB) was computed for each student-item pair (see, e.g., Wise and Kong [2005]) as follows: SB = 1 if the RT was greater than the threshold; SB = 0 otherwise.
The index of item-objective congruence was computed from the specialists' ratings [ 26].
In addition, Ferguson's Delta was computed for each item, giving a second index of item discrimination.
The passing rates and mean scores for each item for children of different ages were calculated to derive an index of item difficulty.
In the subgroup of subjects with moderate dementia, the discrimination powers of 4 of the 5 items were about.4, and the difficulty indices were between.67 and.80 except for the difficulty index of Item 1.
The judgment stage consisted of expert review of domain relevance and representativeness of items in conjunction with numerical summarization of the instrument using a statistical index of item-domain congruence [ 27] and examination for redundancy and internal consistency.
The following steps were adopted in the analyses: Step 1: The passing rates and mean scores for each item for children of different ages were calculated to derive an index of item difficulty.
While the difficulty parameter shows how many teachers answered an item correctly, the discrimination parameter actually is a better index of item quality, as it tells who had the correct answer.
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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