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The police have said the staggered nature of the arrests has been based on their difficulty in identifying the firefighters involved.
What he did, first as a graduate student at Princeton and later at the testing service, was devise a trailblazing mathematical model that enabled test writers to categorize particular questions, based on their difficulty.
This requires also dealing with the issues of assigning ATP problems into classes that are reasonably homogeneous with respect to the ATP systems that (attempt to) solve the problems, and assigning ratings to problems based on their difficulty.
They scanned the pages of over 33,000 children's books and designed a system for rating books based on their difficulty.
The study is to help teachers choose books for children, based on their difficulty, and comes ahead of World Book Day on 7 March.
Individual problems are assigned ratings based on their difficulty.
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Winsteps ranks the items in a hierarchical order based on their item difficulty.
We chose to apply the Rasch method, as this technique produces a scale that calibrates items based on their range of difficulty for the target population.
Items were equally ranked based on their level of difficulty in both cohorts, which supported the stability of items across the different samples.
Some homework tasks were based on their daily life difficulties and problems.
Here we report the development of a diagnostic DNA microarray for the high-throughput identification of 39 pathogenic bacteria selected based on their high prevalence rate and/or difficulty of cultivation.
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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