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Data were analysed from 16 GCSE exams administered in 2015 by the 4 exam boards that provide general qualifications in England. We investigated the comparability of standards at specific grades in the exams between the exam boards.
The main findings include:
higher grades were shown to be generally more comparable than the lower grades in terms of difficulty or standards between the exam board
the relative grade difficulties were broadly consistent
changes in grade outcomes after aligning standards were moderately or highly correlated with those estimated using the existing inter-board statistical screening procedure with mean GCSE score
the use of Rasch ability as a performance measure with the existing inter-board screening procedure produced results which were closely similar to those obtained using mean GCSE score