plot.nffGroupedData {nlme} | R Documentation

## Plot an nffGroupedData Object

### Description

A Trellis dot-plot of the response by group is generated. If outer variables are specified, the combination of their levels are used to determine the panels of the Trellis display. The Trellis function `dotplot` is used.

### Usage

    ## S3 method for class 'nffGroupedData':
    plot(x, outer, inner, innerGroups, xlab, ylab, strip, panel, key,
         grid, ...)

### Arguments

`x` | an object inheriting from class `nffGroupedData`, representing a `groupedData` object with a factor primary covariate and a single grouping level.
`outer` | an optional logical value or one-sided formula, indicating covariates that are outer to the grouping factor, which are used to determine the panels of the Trellis plot. If equal to `TRUE`, `attr(object, "outer")` is used to indicate the outer covariates. An outer covariate is invariant within the sets of rows defined by the grouping factor. Ordering of the groups is done in such a way as to preserve adjacency of groups with the same value of the outer variables. Defaults to `NULL`, meaning that no outer covariates are to be used.
`inner` | an optional logical value or one-sided formula, indicating a covariate that is inner to the grouping factor, which is used to associate points within each panel of the Trellis plot. If equal to `TRUE`, `attr(object, "inner")` is used to indicate the inner covariate. An inner covariate can change within the sets of rows defined by the grouping factor. Defaults to `NULL`, meaning that no inner covariate is present.
`innerGroups` | an optional one-sided formula specifying a factor to be used for grouping the levels of the `inner` covariate. Different colors, or symbols, are used for each level of the `innerGroups` factor. Default is `NULL`, meaning that no `innerGroups` covariate is present.
`xlab` | an optional character string with the label for the horizontal axis. Default is the `y` elements of `attr(object, "labels")` and `attr(object, "units")` pasted together.
`ylab` | an optional character string with the label for the vertical axis. Default is the grouping factor name.
`strip` | an optional function passed as the `strip` argument to the `dotplot` function. Default is `strip.default(..., style = 1)` (see `trellis.args`).
`panel` | an optional function used to generate the individual panels in the Trellis display, passed as the `panel` argument to the `dotplot` function.
`key` | an optional logical function or function. If `TRUE` and either `inner` or `innerGroups` are non-`NULL`, a legend for the different `inner` (`innerGroups`) levels is included at the top of the plot. If given as a function, it is passed as the `key` argument to the `dotplot` function. Default is `TRUE` is either `inner` or `innerGroups` are non-`NULL` and `FALSE` otherwise.
`grid` | this argument is included for consistency with the `plot.nfnGroupedData` method calling sequence. It is ignored in this method function.
`...` | optional arguments passed to the `dotplot` function.

### Value

a Trellis dot-plot of the response by group.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### References

Bates, D.M. and Pinheiro, J.C. (1997), "Software Design for Longitudinal Data", in "Modelling Longitudinal and Spatially Correlated Data: Methods, Applications and Future Directions", T.G. Gregoire (ed.), Springer-Verlag, New York.

Pinheiro, J.C. and Bates, D.M. (1997) "Future Directions in Mixed-Effects Software: Design of NLME 3.0" available at http://franz.stat.wisc.edu/pub/NLME.

### See Also

`groupedData`, `dotplot`

### Examples

    data(Machines)
    plot(Machines)
    plot(Machines, inner = TRUE)

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