A Trellis plot of the response versus the primary covariate is
generated. If outer variables are specified, the combination of their
levels are used to determine the panels of the Trellis
display. Otherwise, the levels of the grouping variable determine the
panels. A scatter plot of the response versus the primary covariate is
displayed in each panel, with observations corresponding to same
inner group joined by line segments. The Trellis function
xyplot is used.
# S3 method for nfnGroupedData
plot(x, outer, inner, innerGroups, xlab, ylab, strip, aspect, panel,
key, grid, ...)a Trellis plot of the response versus the primary covariate.
an object inheriting from class nfnGroupedData,
representing a groupedData object with a numeric primary
covariate and a single grouping level.
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.
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.
an optional one-sided formula specifying a factor
to be used for grouping the levels of the inner
covariate. Different colors, or line types, are used for each level
of the innerGroups factor. Default is NULL, meaning
that no innerGroups covariate is present.
optional character strings with the labels for the
plot. Default is the corresponding elements of attr(object,
"labels") and attr(object, "units") pasted together.
an optional function passed as the strip argument to
the xyplot function. Default is strip.default(..., style
= 1) (see trellis.args).
an optional character string indicating the aspect ratio
for the plot passed as the aspect argument to the
xyplot function. Default is "xy" (see
trellis.args).
an optional function used to generate the individual
panels in the Trellis display, passed as the panel argument
to the xyplot function.
an optional logical function or function. If TRUE
and innerGroups is non-NULL, a legend for the
different innerGroups levels is included at the top of the
plot. If given as a function, it is passed as the key argument
to the xyplot function. Default is TRUE if
innerGroups is non-NULL and FALSE otherwise.
an optional logical value indicating whether a grid should
be added to plot. Default is TRUE.
optional arguments passed to the xyplot function.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
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.
groupedData, xyplot
# different panels per Subject
plot(Orthodont)
# different panels per gender
plot(Orthodont, outer = TRUE)
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