title: A variational Bayesian mixture modelling framework for cluster analysis of gene-expression data.
abstract: BACKGROUND
  Accurate subcategorization of tumour types through gene-expression profiling requires analytical techniques that estimate the number of categories or clusters rigorously and reliably. Parametric mixture modelling provides a natural setting to address this problem.
  
  
  RESULTS
  We compare a criterion for model selection that is derived from a variational Bayesian framework with a popular alternative based on the Bayesian information criterion. Using simulated data, we show that the variational Bayesian method is more accurate in finding the true number of clusters in situations that are relevant to current and future microarray studies. We also compare the two criteria using freely available tumour microarray datasets and show that the variational Bayesian method is more sensitive to capturing biologically relevant structure.
authors.affiliation: Department of Oncology, Cancer Genomics Program, Hutchison-MRC Research Centre, University of Cambridge Hills Road, Cambridge CB2 2XZ, UK. aet21@cam.ac.uk
authors.forename: Andrew E
authors.initials: AE
authors.lastname: Teschendorff
authors.forename: Yanzhong
authors.initials: Y
authors.lastname: Wang
authors.forename: Nuno L
authors.initials: NL
authors.lastname: Barbosa-Morais
authors.forename: James D
authors.initials: JD
authors.lastname: Brenton
authors.forename: Carlos
authors.initials: C
authors.lastname: Caldas
mesh_terms: D000465:Algorithms; D001499:Bayes Theorem; D016000:Cluster Analysis; D003198:Computer Simulation; D020869:Gene Expression Profiling / Q000379:methods*; D008954:Models, Biological; D015233:Models, Statistical; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D018401:Sample Size; D012984:Software