xps (version 1.32.0)

diffFilter-methods: Difference Filter

Description

This method initializes the Difference Filter. The difference is the maximum value minus minimum value for each row of the expression dataframe divided by the mean value of each row. The Difference Filter flags all rows with: flag = ((max - min)/mean >= cutoff)

Usage

diffFilter(object) diffFilter(object, value)<-

Arguments

object

object of class PreFilter.

value

numeric vector c(cutoff, trim, epsilon).

Value

An initialized PreFilter object.

Details

The method diffFilter initializes the following parameters:

	cutoff:
the cutoff level for the filter.
trim:	the trim value for trimmed mean (default is trim=0).
	epsilon:
value to replace mean (default is epsilon=0.01):
	epsilon > 0: replace mean=0 with epsilon.

Note, that for epsilon = 0 the filter flags all rows with: (max - min) >= cutoff

Examples

prefltr <- PreFilter()
diffFilter(prefltr) <- c(2.2,0.0,0.01)
str(prefltr)