lattice (version 0.20-21)

F_2_panel.spline: Panel Function to Add a Spline Smooth

Description

A predefined panel function that can be used to add a spline smooth based on the provided data.

Usage

panel.spline(x, y, npoints = 101,
             lwd = plot.line$lwd,
             lty = plot.line$lty,
             col, col.line = plot.line$col,
             type,
             horizontal = FALSE, ...,
             keep.data = FALSE,
             identifier = "spline")

Arguments

x, y

Variables defining the data to be used.

npoints

The number of equally spaced points within the range of the predictor at which the fitted model is evaluated for plotting.

lwd, lty, col, col.line

Graphical parameters for the added line. col.line overrides col.

type

Ignored. The argument is present only to make sure that an explicitly specified type argument (perhaps meant for another function) does not affect the display.

horizontal

A logical flag controlling which variable is to be treated as the predictor (by default x) and which as the response (by default y). If TRUE, the plot is transposed in the sense that

keep.data

Passed on to smooth.spline. The default here (FALSE) is different, and results in the original data not being retained in the fitted spline model. It may be useful to set th

...

Extra arguments, passed on to smooth.spline and panel.lines as appropriate.

identifier

A character string that is prepended to the names of grobs that are created by this panel function.

Value

• The fitted model as returned by smooth.spline.

See Also

Lattice, smooth.spline, prepanel.spline