F_3_prepanel.functions: Useful Prepanel Function for Lattice

Description

These are predefined prepanel functions available in Lattice.

Usage

prepanel.lmline(x, y, ...)
prepanel.qqmathline(x, y = x, distribution = qnorm,
                    probs = c(0.25, 0.75), qtype = 7,
                    groups, subscripts,
                    ...) 
prepanel.loess(x, y, span, degree, family, evaluation,
               horizontal = FALSE, ...)
prepanel.spline(x, y, npoints = 101, 
                horizontal = FALSE, ...,
                keep.data = FALSE)

Value

usually a list with components xlim, ylim, dx and

dy, the first two being used to calculate panel axes limits, the last two for banking computations. The form of these components are described under xyplot. There are also several prepanel functions that serve as the default for high level functions, see prepanel.default.xyplot

Arguments

x, y: x and y values, numeric or factor
distribution: quantile function for theoretical distribution. This is automatically passed in when this is used as a prepanel function in qqmath.
qtype: type of quantile
probs: numeric vector of length two, representing probabilities. If used with aspect="xy", the aspect ratio will be chosen to make the line passing through the corresponding quantile pairs as close to 45 degrees as possible.
span, degree, family, evaluation: Arguments controlling the underlying loess smooth.
horizontal, npoints: See documentation for corresponding panel function.
keep.data: Ignored. Present to capture argument of the same name in smooth.spline.
groups, subscripts: See xyplot. Whenever appropriate, calculations are done separately for each group and then combined.
...: Other arguments. These are passed on to other functions if appropriate (in particular, smooth.spline), and ignored otherwise.

Author

Deepayan Sarkar Deepayan.Sarkar@R-project.org

Details

All these prepanel functions compute the limits to be large enough to contain all points as well as the relevant smooth.