relevance (version 2.1)

plot.inference: Plot Inference Results

Description

Plot confidence or relevance interval(s) for one or several items

Usage

# S3 method for inference
plot(x, pos = NULL, overlap = FALSE, 
  refline = c(0,1,-1), xlab = "relevance", ...)
# S3 method for termeffects
plot(x, pos = NULL, single=FALSE,
  overlap = TRUE, termeffects.gap = 0.2, refline = c(0, 1, -1),
  xlim=NULL, ylim=NULL, xlab = "relevance", mar=NA,
  labellength=getOption("labellength"), ...)

Value

none

Arguments

x

a vector or matrix of class inference.

pos

positions of the bars in vertical direction

overlap

logical: should shortened intervals be shown to show significance of differences? see Details

refline

values for vertical reference lines

single

logical: should terms with a single degree of freedom be plotted?

termeffects.gap

gap between blocks corresponding to terms

xlim, ylim

limits of plotting area, as usual

xlab

label for horizontal axis

mar

plot margins. If NULL (default), the left side margin will be adjusted to accomodate the labels of effects of factor levels

labellength

maximum number of characters for label strings

...

further arguments to the call of plot.inference (forplot.termeffects) and plot

Author

Werner A. Stahel

Details

The overlap interval allows for a graphical assessment of the significance of the test for zero difference(s), akin the notches in the box plots: The difference between a pair of groups is siginificant if their overlap intervals do not overlap. For equal standard errors of the groups, the standard error of the difference between two of them is larger by the factor sqrt(2). Therefore, the intervals should be shortened by this factor, or multiplied by 1/sqrt(2), which is the default for overlapfactor. If only two groups are to be shown, the factor is adjusted to unequal standard errors.

The graphical options are:

lwd:

line widths for: [1] the interval, [2] middle mark, [3] end marks, [4] overlap interval marks, [5] vertical line marking the relevance threshold

markheight:

determines the length of the middle mark, the end marks and the marks for the overlap interval as a multiplier of the default length

extend:

extension of the vertical axis beyond the range

framecol:

color to be used for the framing lines: axis and vertical lines at relevances 0 and 1

See Also

plconfint

Examples

## --- regression
data(swiss)
rr <- lm(Fertility ~ . , data = swiss)
rt <- termtable(rr)
plot(rt)

## --- termeffects
data(d.blast)
rlm <- lm(log10(tremor)~location+log10(distance)+log10(charge), data=d.blast)
rte <- termeffects(rlm)
plot(rte, single=TRUE)