plot.nffGroupedData {nlme}

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)

José Pinheiro and Douglas Bates [e-mail]

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.

See Also

groupedData, dotplot

Examples

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