normalize.ExpressionSet {affyPLM} | R Documentation

## Normalization applied to ExpressionSets

### Description

Allows the user to apply normalization routines to ExpressionSets.

### Usage

      normalize.ExpressionSet.quantiles(eset,transfn=c("none","log","antilog"))
      normalize.ExpressionSet.loess(eset,transfn=c("none","log","antilog"),...)
      normalize.ExpressionSet.contrasts(eset, span = 2/3, choose.subset = TRUE, subset.size = 5000, verbose = TRUE, family = "symmetric",transfn=c("none","log","antilog"))
      normalize.ExpressionSet.qspline(eset,transfn=c("none","log","antilog"),...)
      normalize.ExpressionSet.invariantset(eset,prd.td = c(0.003, 0.007),verbose=FALSE,transfn=c("none","log","antilog"),baseline.type=c("mean","median","pseudo-mean","pseudo-median"))
    normalize.ExpressionSet.scaling(eset,trim=0.02,baseline=-1,transfn=c("none","log","antilog"))

### Arguments

`eset` | An `ExpressionSet`
`span` | parameter to be passed to the function `loess`.
`choose.subset` |
`subset.size` |
`verbose` | verbosity flag
`family` | parameter to be passed to the function `loess`.
`prd.td` | cutoff parameter (details in the bibliographic reference)
`trim` | How much to trim from the top and bottom before computing the mean when using the scaling normalization
`baseline` | Index of array to use as baseline, negative values (-1,-2,-3,-4) control different baseline selection methods
`transfn` | Transform the ExpressionSet before normalizing. Useful when dealing with expression values that are log-scale
`baseline.type` | A method of selecting the baseline array
`...` | Additional parameters that may be passed to the normalization routine

### Details

This function carries out normalization of expression values. In general you should either normalize at the probe level or at the expression value level, not both.

Typing `normalize.ExpressionSet.methods` should give you a list of methods that you may use. note that you can also use the `normalize` function on ExpressionSets. Use `method` to select the normalization method.

### Value

A normalized `ExpressionSet`.

### Author(s)

Ben Bolstad, bmb@bmbolstad.com

### References

Bolstad, BM (2004) Low Level Analysis of High-density Oligonucleotide Array Data: Background, Normalization and Summarization. PhD Dissertation. University of California, Berkeley.

### See Also

`normalize`

### Examples

    if (require(affydata)) {
      data(Dilution)
      eset <- rma(Dilution, normalize=FALSE, background=FALSE)
      normalize(eset)
    }

[Package affyPLM version 1.18.1 Index]