Research and analysis

Marker effects and examination reliability

This study looked at how three different analysis methods could help us to understand 'rater' effects on exam reliability.

From:
Ofqual
Published
21 January 2013

Applies to England

Documents

Marker effects and examination reliability: A comparative exploration from the perspectives of generalizability theory, Rasch modelling and multilevel modelling

Ref: Ofqual/13/5261

PDF, 1.89 MB, 87 pages

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Details

This study looked at how three different analysis methods could help us to understand rater effects on exam reliability. The techniques we looked at were:

  • generalizability theory (G-theory)
  • item response theory (IRT): in particular the Many-Facets Partial Credit Rasch Model (MFRM)
  • multilevel modelling (MLM)

We used data from AS component papers in geography and psychology for 2009, 2010 and 2011 from Edexcel.

Published 21 January 2013

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