# panel.qqmath: Default Panel Function for qqmath In lattice: Trellis Graphics for R

## Description

This is the default panel function for `qqmath`.

## Usage

 ```1 2 3 4 5 6``` ```panel.qqmath(x, f.value = NULL, distribution = qnorm, qtype = 7, groups = NULL, ..., tails.n = 0, identifier = "qqmath") ```

## Arguments

 `x` vector (typically numeric, coerced if not) of data values to be used in the panel. `f.value, distribution` Defines how quantiles are calculated. See `qqmath` for details. `qtype` The `type` argument to be used in `quantile` `groups` An optional grouping variable. Within each panel, one Q-Q plot is produced for every level of this grouping variable, differentiated by different graphical parameters. `...` Further arguments, often graphical parameters, eventually passed on to `panel.xyplot`. Arguments `grid` and `abline` of `panel.xyplot` may be particularly useful. `tails.n` number of data points to represent exactly on each tail of the distribution. This reproduces the effect of `f.value = NULL` for the extreme data values, while approximating the remaining data. It has no effect if `f.value = NULL`. If `tails.n` is given, `qtype` is forced to be 1. `identifier` A character string that is prepended to the names of grobs that are created by this panel function.

## Details

Creates a Q-Q plot of the data and the theoretical distribution given by `distribution`. Note that most of the arguments controlling the display can be supplied directly to the high-level `qqmath` call.

## Author(s)

Deepayan Sarkar [email protected]

`qqmath`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```set.seed(0) xx <- rt(10000, df = 10) qqmath(~ xx, pch = "+", distribution = qnorm, grid = TRUE, abline = c(0, 1), xlab.top = c("raw", "ppoints(100)", "tails.n = 50"), panel = function(..., f.value) { switch(panel.number(), panel.qqmath(..., f.value = NULL), panel.qqmath(..., f.value = ppoints(100)), panel.qqmath(..., f.value = ppoints(100), tails.n = 50)) }, layout = c(3, 1))[c(1,1,1)] ```

### Example output

```
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lattice documentation built on May 31, 2017, 4:47 a.m.