MAMA (version 1.0.2)

sd.filter: Microarray probes filtering

Description

Function to filter microarray probes according to standard deviation

Usage

sd.filter(data, cutoff = 0.5)

Arguments

data

expression matrix with probes in rows and samples in columns

cutoff

cutoff value for filtering

Value

• Expression matrix, probes with SD below cutoff are filtered out.

Examples

## The function is currently defined as
function(data, cutoff=0.5)
{
sd<-apply(data,1,sd)
plot(sort(sd), ylab="Standard deviation")
abline(h=0.5,col="red")
data<-data[sd>cutoff,]
return(data)
  }