title: Differential expression in SAGE: accounting for normal between-library variation.
abstract: BACKGROUND
  In contrasting levels of gene expression between groups of SAGE libraries, the libraries within each group are often combined and the counts for the tag of interest summed, and inference is made on the basis of these larger 'pseudolibraries'. While this captures the sampling variability inherent in the procedure, it fails to allow for normal variation in levels of the gene between individuals within the same group, and can consequently overstate the significance of the results. The effect is not slight: between-library variation can be hundreds of times the within-library variation.
  
  
  RESULTS
  We introduce a beta-binomial sampling model that correctly incorporates both sources of variation. We show how to fit the parameters of this model, and introduce a test statistic for differential expression similar to a two-sample t-test.
authors.affiliation: Department of Biostatistics, UT M.D. Anderson Cancer Center, 1515 Holcombe Blvd, Box 447, Houston, TX 77030-4009, USA. kabagg@mdanderson.org
authors.forename: Keith A
authors.initials: KA
authors.lastname: Baggerly
authors.forename: Li
authors.initials: L
authors.lastname: Deng
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Morris
authors.forename: C Marcelo
authors.initials: CM
authors.lastname: Aldaz
mesh_terms: D000465:Algorithms; D020224:Expressed Sequence Tags; D020869:Gene Expression Profiling / Q000379:methods*; D015723:Gene Library; D014644:Genetic Variation; D008957:Models, Genetic; D015233:Models, Statistical; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017422:Sequence Analysis, DNA / Q000379:methods*