volcanoplot {limma} | R Documentation

## Volcano Plot

### Description

Creates a volcano plot of log-fold changes versus log-odds of differential expression.

### Usage

    volcanoplot(fit, coef=1, highlight=0, names=fit$genes$ID, xlab="Log Fold Change", ylab="Log Odds", pch=16, cex=0.35, ...)

### Arguments

`fit` | an `MArrayLM` fitted linear model object
`coef` | integer giving the coefficient
`highlight` | number of top genes to be highlighted
`names` | character vector giving text labels for the probes to be used in highlighting
`xlab` | character string giving label for x-axis
`ylab` | character string giving label for y-axis
`pch` | vector or list of plotting characters. Default is integer code 16 which gives a solid circle.
`cex` | numeric vector of plot symbol expansions. Default is 0.35.
`...` | any other arguments are passed to `plot`

### Details

A volcano plot is any plot which displays fold changes versus a measure of statistical significance of the change.

### Value

A plot is created on the current graphics device.

### Author(s)

Gordon Smyth

### See Also

An overview of presentation plots following the fitting of a linear model in LIMMA is given in 06.LinearModels.

### Examples

    #  See lmFit examples

[Package limma version 2.18.3 Index]