normalize.invariantset {affy} | R Documentation

## Invariant Set normalization

### Description

Normalize arrays in an `AffyBatch` using an invariant set.

### Usage

    normalize.AffyBatch.invariantset(abatch, prd.td = c(0.003, 0.007),
                                     verbose = FALSE,
                                     baseline.type = c("mean","median","pseudo-mean","pseudo-median"),
                                     type = c("separate","pmonly","mmonly","together"))

    normalize.invariantset(data, ref, prd.td=c(0.003,0.007))

### Arguments

`abatch` | an `AffyBatch` object.
`data` | a vector of intensities on a chip (to normalize to the reference).
`ref` | a vector of reference intensities.
`prd.td` | cutoff parameter (details in the bibliographic reference).
`baseline.type` | specifies how to determine the baseline array.
`type` | a string specifying how the normalization should be applied. See details for more.
`verbose` | logical indicating printing throughout the normalization.

### Details

The set of invariant intensities between `data` and `ref` is found through an iterative process (based on the respective ranks the intensities). This set of intensities is used to generate a normalization curve by smoothing.

The `type` argument should be one of `"separate","pmonly","mmonly","together"` which indicates whether to normalize only one probe type (PM,MM) or both together or separately.

### Value

Respectively a `AffyBatch` of normalized objects, or a vector of normalized intensities, with an attribute "invariant.set" holding the indexes of the 'invariant' intensities.

### Author(s)

L. Gautier <laurent@cbs.dtu.dk> (Thanks to Cheng Li for the discussions about the algorithm.)

### References

Cheng Li and Wing Hung Wong, Model-based analysis of oligonucleotides arrays: model validation, design issues and standard error application. Genome Biology 2001, 2(8):research0032.1-0032.11

### See Also

`normalize` to normalize `AffyBatch` objects.

[Package affy version 1.64.0 Index]