QQ.plot {CGEN} | R Documentation

## QQ plot

### Description

Create a quantile-quantile plot

### Usage

     QQ.plot(pvalues, op=NULL)

### Arguments

`pvalues` | Vector or matrix of p-values. No default.
`op` | List of options (see details). The default is NULL.

### Details

Plots the ranked p-values against their expected order statistics on a minus log base 10 scale. If `pvalues` is a matrix, then multiple qq plots will be produced, each on a seperate screen. Options list op: Below are the names for the options list `op`. All names have default values if they are not specified.

- `cex` Magnification factor for the plotting symbol. The default is 1.

- `cex.axis` Magnification factor for the axes. The default is 1.

- `cex.lab` Magnification factor for the axes labels. The default is 1.

- `cex.main` Magnification factor for the title. The default is 1.

- `color` The color of the plot and title. The default is "blue".

- `figs` Two element vector for the number of rows and columns if `pvalues` is a matrix. The default is NULL.

- `min.p` All p-values less than `min.p` will be set to `min.p`. The default is 1e-16.

- `pch` The plotting symbol. The default is 21 (circle).

- `title` Character string or vector for the title of each plot. If `pvalues` is a matrix, then the column names will be used if `title` is NULL. The default is NULL.

- `xlim` The x-axis limits. The default is determined from `pvalues`.

- `ylim` The y-axis limits. The default is determined from `pvalues`.

### See Also

`Manhattan.plot`

### Examples

      set.seed(123)
      p <- runif(1000)
      QQ.plot(p)

[Package CGEN version 3.20.0 Index]