R: Trellis Displays of Empirical CDF

ecdfplot {latticeExtra} | R Documentation

## Trellis Displays of Empirical CDF

### Description

Conditional displays of Empirical Cumulative Distribution Functions

### Usage

    ecdfplot(x, data, ...)

    ## S3 method for class 'formula'
    ecdfplot(x, data,
             prepanel = "prepanel.ecdfplot",
             panel = "panel.ecdfplot",
             ylab,
             ...)
    ## S3 method for class 'numeric'
    ecdfplot(x, data = NULL, xlab, ...)

    prepanel.ecdfplot(x, f.value = NULL, ...)

    panel.ecdfplot(x, f.value = NULL, type = "s",
                   groups = NULL, qtype = 7,
                   ref = TRUE,
                   ...)

### Arguments

`x` | For `ecdfplot`, `x` is the object on which method dispatch is carried out. For the `"formula"` method, `x` is a formula describing the form of conditioning plot, and has to be of the form `~x`, where `x` is assumed to be a numeric vector. Further conditioning variables are allowed as usual. A similar interpretation holds for `x` in the `"numeric"` method as well as `prepanel.ecdfplot` and `panel.ecdfplot`.
`data` | For the `"formula"` method, a data frame containing values for any variables in the formula, as well as those in `groups` and `subset` if applicable.
`prepanel, panel` | panel and prepanel function used to create the display.
`xlab, ylab` | axis labels; typically a character string or an expression.
`groups` | a grouing variable of the same length as `x`. If specified, ECDF plots are computed for each subset defined by unique values of `groups` and the resulting functions superposed within each panel.
`f.value, qtype` | Defines how quantiles are calculated. See `panel.qqmath`.
`ref` | logical, whether a reference line should be drawn at 0 and 1
`type` | how the plot is rendered; see `panel.xyplot`
`...` | extra arguments, passed on as appropriate. Standard lattice arguments as well as arguments to `panel.ecdfplot` can be supplied directly in the high level `ecdfplot` call.

### Value

`ecdfplot` produces an object of class `"trellis"`. The `update` method can be used to update components of the object and the `print` method (usually called by default) will plot it on an appropriate plotting device.

### Author(s)

Deepayan Sarkar deepayan.sarkar@r-project.org

### See Also

`qqmath` for Quantile plots which are more generally useful, especially when comparing with a theoretical distribution other than uniform. An ECDF plot is essentially a transposed version (i.e., with axes switched) of a uniform quantile plot.

### Examples

    data(singer, package = "lattice")
    ecdfplot(~height | voice.part, data = singer)

[Package latticeExtra version 0.6-28 Index]