viper: VIPER

Description Usage Arguments Value See Also Examples

View source: R/viper.r

Description

This function performs Virtual Inference of Protein-activity by Enriched Regulon analysis

Usage

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viper(eset, regulon, dnull = NULL, pleiotropy = FALSE, nes = TRUE,
  method = c("none", "scale", "rank", "mad", "ttest"), bootstraps = 0,
  minsize = 25, adaptive.size = FALSE, eset.filter = TRUE,
  mvws = 1, pleiotropyArgs = list(regulators = 0.05, shadow = 0.05,
  targets = 10, penalty = 20, method = "adaptive"), cores = 1,
  verbose = TRUE)

Arguments

eset

ExpressionSet object or Numeric matrix containing the expression data or gene expression signatures, with samples in columns and genes in rows

regulon

Object of class regulon or list of objects of class regulon for metaVIPER analysis

dnull

Numeric matrix for the null model, usually generated by nullTtest

pleiotropy

Logical, whether correction for pleiotropic regulation should be performed

nes

Logical, whether the enrichment score reported should be normalized

method

Character string indicating the method for computing the single samples signature, either scale, rank, mad, ttest or none

bootstraps

Integer indicating the number of bootstraps iterations to perform. Only the scale method is implemented with bootstraps.

minsize

Integer indicating the minimum number of targets allowed per regulon

adaptive.size

Logical, whether the weighting scores should be taken into account for computing the regulon size

eset.filter

Logical, whether the dataset should be limited only to the genes represented in the interactome #' @param mvws Number or vector indicating either the exponent score for the metaViper weights, or the inflection point and trend for the sigmoid function describing the weights in metaViper

pleiotropyArgs

list of 5 numbers for the pleotropy correction indicating: regulators p-value threshold, pleiotropic interaction p-value threshold, minimum number of targets in the overlap between pleiotropic regulators, penalty for the pleiotropic interactions and the method for computing the pleiotropy, either absolute or adaptive

cores

Integer indicating the number of cores to use (only 1 in Windows-based systems)

verbose

Logical, whether progression messages should be printed in the terminal

Value

A matrix of inferred activity for each regulator gene in the network across all samples

See Also

msviper

Examples

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data(bcellViper, package="bcellViper")
d1 <- exprs(dset)
res <- viper(d1, regulon)
dim(d1)
d1[1:5, 1:5]
regulon
dim(res)
res[1:5, 1:5]

Example output

Loading required package: Biobase
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package:BiocGenericsThe following objects are masked frompackage:parallel:

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked frompackage:stats:

    IQR, mad, sd, var, xtabs

The following objects are masked frompackage:base:

    anyDuplicated, append, as.data.frame, basename, cbind, colnames,
    dirname, do.call, duplicated, eval, evalq, Filter, Find, get, grep,
    grepl, intersect, is.unsorted, lapply, Map, mapply, match, mget,
    order, paste, pmax, pmax.int, pmin, pmin.int, Position, rank,
    rbind, Reduce, rownames, sapply, setdiff, sort, table, tapply,
    union, unique, unsplit, which.max, which.min

Welcome to Bioconductor

    Vignettes contain introductory material; view with
    'browseVignettes()'. To cite Bioconductor, see
    'citation("Biobase")', and for packages 'citation("pkgname")'.


Computing the association scores
Computing regulons enrichment with aREA

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  |======================================================================| 100%[1] 6249  211
      GSM44075  GSM44078 GSM44080  GSM44081 GSM44082
ADA   9.571369 10.599436 8.740659 10.104469 8.918148
CDH2  6.175890  5.312704 5.651928  4.462205 4.807664
MED6  9.671113  8.773383 9.190276  9.526235 8.795248
NR2E3 9.847733  9.582061 9.628792  8.820422 9.270526
ACOT8 9.083551  9.043654 8.010374  8.683276 8.744792
Object of class regulon with 621 regulators, 6249 targets and 172240 interactions
[1] 621 211
        GSM44075     GSM44078   GSM44080   GSM44081  GSM44082
AATF   7.1823382  4.642804635  7.4858308  7.0831808  6.473570
ADNP   3.4591275  1.972037051  3.3625029  4.6900031  3.415285
ADNP2  0.4334423  0.004665852  0.4110936  0.5721498  0.540023
AEBP1 -6.0201433 -3.774699249 -5.6031467 -5.0785343 -5.934232
AFF3  -1.5112415 -1.025039393 -2.6894286 -2.0569731 -1.276213

viper documentation built on Nov. 8, 2020, 7:37 p.m.