fcFilter-methods: Fold-Change Filter

In xps: Processing and Analysis of Affymetrix Oligonucleotide Arrays including Exon Arrays, Whole Genome Arrays and Plate Arrays

Description

This method initializes the Fold-Change Filter.
The fold-change is determined by the mean value of group 2 divided by the mean value of group 1.
The Fold-Change Filter flags all rows with: flag = (fc >= cutoff)

Usage

fcFilter(object)
fcFilter(object, value)<-

Arguments

object	object of class UniFilter.
value	numeric vector c(cutoff, direction)

Details

The method fcFilter initializes the following parameters:

	cutoff:	the cutoff level for the filter.
	direction:	direction="both" (default): select up and downregulated genes.
		direction="up": select upregulated genes only.
		direction="down": select downregulated genes only.

Value

An initialized UniFilter object.

Author(s)

Christian Stratowa

Examples

unifltr <- UniFilter()
fcFilter(unifltr) <- c(1.5,"both")
str(unifltr)

xps documentation built on Nov. 8, 2020, 6 p.m.