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In general you seem to have found the puzzle of average difficulty.
The Bad partition contains pairs of images of average difficulty to recognize.
The report found that while the average difficulty of books rose as pupils got older, it did not match the rate at which reading skills should be improving.
Most who commented said they found BEWITCH a reasonably friendly clue word in a plain puzzle of average difficulty, presenting few real problems, i.e. the kind I ideally aim for.
To examine the time-course of cognitive training, we calculated standardized improvement scores at each of the 20 training sessions by converting the average difficulty for each task to a standardized score for each of the four active training groups (three experimental groups and an active control group).
GR7 = (Grade x Modal Shift) / Average Difficulty.
To answer the first research question, we first look at the average difficulty for each combination.
Moreover, the content of Proportional Reasoning shows the opposite pattern: tier 1 items are actually harder on average (average difficulty estimate of 0.57), whereas the tier 2 items are relatively easier on average (average difficulty estimate of −0.40).
Combinatorial Reasoning follows the pattern similar to the LPDI items in data set 1: tier 1 items are somewhat easier (average difficulty estimate of −0.16) than the tier 2 items (average difficulty estimate of 0.02).
Items with an average difficulty level are those in the Range of Validity determined by the Test Information Curve.
If the average difficulty for each combination is different, it could mean that we can control the item difficulty by varying the factors.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com