mark.H0: Mark a point null hypothesis in an HE plot
In heplots: Visualizing Hypothesis Tests in Multivariate Linear Models

Description Usage Arguments Value Author(s) See Also Examples

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).

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

`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

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

Michael Friendly

cross3d, ~~~

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()