findBeadStatus {beadarray} | R Documentation

## Find Outliers

### Description

Function finds all beads which are outliers for a given bead type

### Usage

    findBeadStatus(BLData, probes, array = 1, log = FALSE, what = "G", n = 3,
               outputValid = FALSE, intProbeID = NULL, ignoreList = NULL,
               probeIndex = NULL, startSearch = 1)
    getProbeIntensities(BLData, ProbeIDs, array = 1, log = TRUE, what = "G")

### Arguments

`BLData` | `BeadLevelList`
`probes` | numeric vector for the ProbeIDs of the bead type we want to find outliers for
`array` | integer specifying which strip/array to use
`log` | if TRUE the intensities will be calculated on the log2 scale. Otherwise un-logged data is used
`what` | character string specifying which intensities to use. Possibilities are `"G"`, `"Gb"` for single channel data and `"G"`, `"Gb"`, `"R"` and `"Rb"` for two-colour data
`n` | numeric value defining a cut-off for the number of median absolute deviations (MADs) from the median to use for determining outliers. The default value is 3.
`outputValid` | if TRUE the IDs of beads which are not outliers will be output
`intProbeID` | BLData$ProbeID coerced to vector of integers. Never change this, for internal use only
`ignoreList` | list of ProbeIDs to be omitted from the averaging procedure. These could be Illumina internal controls which are replicated many thousands of times on arrays
`probeIndex` | parameter for internal use only
`startSearch` | integer specify where to start searching for a particular ProbeID
`ProbeIDs` | numeric vector for the ProbeIDs of the bead type we want to find outliers for

### Details

The intensities of each bead with ProbeID 'probe' on the specified array are found and if the 'log' parameter is set to TRUE we do a log2 transformation of these values.

The median and MAD for the bead intensities are then calculated. Outliers are beads which have intensity more than 'n' MADs from the median.

The method used by Illumina is to use un-logged intensities with 'n' = 3.

Any beads which have intensity NA are also counted as outliers.

The function returns only the outliers for a bead type unless the outputValid parameter is specified.

### Value

List of beadIDs dividing the beads of this bead type into two categories.

`valid` | valid beads
`outliers` | beads which are calculated as outliers

### Author(s)

Mike Smith and Mark Dunning

### See Also

`findAllOutliers`

### Examples

    data(BLData)
    findBeadStatus(BLData, 2, 1, outputValid=TRUE)
    findBeadStatus(BLData, 2, 1, log=TRUE, outputValid=TRUE)
    findBeadStatus(BLData, 23, 1, outputValid=TRUE)
    findBeadStatus(BLData, 23, 1, log=TRUE, outputValid=TRUE)

[Package beadarray version 1.8.0 Index]