To install this package, start R and enter:

source("http://bioconductor.org/biocLite.R")
biocLite("twilight")

In most cases, you don't need to download the package archive at all.

twilight

Estimation of local false discovery rate

Bioconductor version: 2.14

In a typical microarray setting with gene expression data observed under two conditions, the local false discovery rate describes the probability that a gene is not differentially expressed between the two conditions given its corrresponding observed score or p-value level. The resulting curve of p-values versus local false discovery rate offers an insight into the twilight zone between clear differential and clear non-differential gene expression. Package 'twilight' contains two main functions: Function twilight.pval performs a two-condition test on differences in means for a given input matrix or expression set and computes permutation based p-values. Function twilight performs a stochastic downhill search to estimate local false discovery rates and effect size distributions. The package further provides means to filter for permutations that describe the null distribution correctly. Using filtered permutations, the influence of hidden confounders could be diminished.

Author: Stefanie Scheid <stefanie.scheid at gmx.de>

Maintainer: Stefanie Scheid <stefanie.scheid at gmx.de>

Citation (from within R, enter citation("twilight")):

Installation

To install this package, start R and enter:

source("http://bioconductor.org/biocLite.R")
biocLite("twilight")

Documentation

To view documentation for the version of this package installed in your system, start R and enter:

browseVignettes("twilight")

 

PDF R Script Estimation of Local False Discovery Rates
PDF   Reference Manual

Details

biocViews DifferentialExpression, Microarray, MultipleComparison, Software
Version 1.40.0
In Bioconductor since BioC 1.6 (R-2.1) or earlier
License GPL (>= 2)
Depends R (>= 2.10), splines (>= 2.2.0), stats (>= 2.2.0), Biobase(>= 1.12.0)
Imports Biobase, graphics, grDevices, stats
Suggests golubEsets(>= 1.4.2), vsn(>= 1.7.2)
System Requirements
URL http://compdiag.molgen.mpg.de/software/twilight.shtml
Depends On Me OrderedList
Imports Me OrderedList
Suggests Me

Package Archives

Follow Installation instructions to use this package in your R session.

Package Source twilight_1.40.0.tar.gz
Windows Binary twilight_1.40.0.zip (32- & 64-bit)
Mac OS X 10.6 (Snow Leopard) twilight_1.40.0.tgz
Mac OS X 10.9 (Mavericks) twilight_1.40.0.tgz
Browse/checkout source (username/password: readonly)
Package Downloads Report Download Stats

Mailing Lists »

Post questions about Bioconductor packages to our mailing lists. Read the posting guide before posting!

Fred Hutchinson Cancer Research Center