heplots (version 1.2-0)

mark.H0: Mark a point null hypothesis in an HE plot

Description

A utility function to draw and label a point in a 2D (or 3D) HE plot corresponding to a point null hypothesis being tested. This is most useful for repeated measure designs where null hypotheses for within-S effects often correspond to (0,0).

Usage

mark.H0(x = 0, y = 0, z=NULL, label, cex = 2, pch = 19, col = "green3", lty = 2, pos = 2)

Arguments

x

Horizontal coordinate for H0

y

Vertical coordinate for H0

z

z coordinate for H0. If not NULL, the function assumes that a heplot3d plot has been drawn.

label

Text used to label the point. Defaults to expression(H[0]) in 2D plots.

cex

Point and text size. For 3D plots, the function uses size=5*cex in a call to points3d.

pch

Plot character. Ignored for 3D plots.

col

Color for text, character and lines

lty

Line type for vertical and horizontal reference lines. Not drawn if lty=0.

pos

Position of text. Ignored for 3D plots

Value

• None. Used for side effect of drawing on the current plot.

See Also

cross3d, ~~~

Examples

Vocab.mod <- lm(cbind(grade8,grade9,grade10,grade11) ~ 1, data=VocabGrowth)
idata <-data.frame(grade=ordered(8:11))

heplot(Vocab.mod, type="III", idata=idata, idesign=~grade, iterm="grade",
	main="HE plot for Grade effect")
mark.H0()