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Figure 3 | BMC Medical Education

Figure 3

From: Implementing statistical equating for MRCP(UK) parts 1 and 2

Figure 3

Example of DIF analysis for a Part 1 diet. The threshold (difficulty) for each item on the exam is calculated separately for UK candidates (ThresUK, horizontal axis) and non-UK candidates (ThresNonUK), with higher scores indicating more difficult questions. The significance of the difference between the two thresholds is calculated by Bilog and indicated by the colour of the points (see legend).

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