Rasch fit statistics and sample size considerations for polytomous data

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Research article

Adam B Smith¹^,2 , Robert Rush³ , Lesley J Fallowfield⁴ , Galina Velikova¹^* and Michael Sharpe⁵^*

¹Cancer Research UK – Clinical Centre, St. James's University Hospital, Leeds, UK

²Centre for Health & Social Care, University of Leeds, Leeds, UK

³Centre for Integrated Health Research, Queen Margaret University, Edinburgh, UK

⁴Psychosocial Oncology Group – Cancer Research UK, University of Sussex, UK

⁵School of Molecular & Clinical Medicine, University of Edinburgh, Edinburgh, UK

author email corresponding author email* Contributed equally

BMC Medical Research Methodology 2008, 8:33doi:10.1186/1471-2288-8-33


Published:	29 May 2008

Additional file 1:

The file format is in MS Word, and is entitled "Appendix 1". It contains five formulae with descriptions.

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