R: Default Panel Function for qqmath

F_1_panel.qqmath {lattice} | R Documentation

## Default Panel Function for qqmath

### Description

This is the default panel function for `qqmath`.

### Usage

    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 Deepayan.Sarkar@R-project.org

### See Also

`qqmath`

### Examples

    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)]

[Package lattice version 0.20-6 Index]