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  1. A Rasch analysis of the quality of marking of GCSE Science

    Authors: 
    William Pointer

    The reintroduction of an examination that combines biology, chemistry and physics has created the potential for a reduction in the reliability of marking....

  2. Difficulty plots: DIF analysis without the partial credit model

    Authors: 
    Elizabeth Harrison

    From summer 2017, the preferred method for vertical scaling of tiered exams will be chained equipercentile equating. AQA has previously used the partial credit model (PCM) to perform vertical scaling....