interaction.positioned

From HH v3.1-8 by Richard Heiberger

interaction method for positioned factors.

This is intended to be a method for interaction for positioned factors. Since interaction is not currently implemented as a generic, interaction.positioned is a standalone function. The result is assigned a position. The position for each interaction level is the position of the corresponding a factor plus a scaled level of the b factor. The default scale is .1.

Keywords: regression, dplot

Usage

interaction.positioned(...,  ## exactly two factors
             drop = FALSE, sep = ".",
             b.offset=0,
             b.scale=.1)

Arguments

...: exactly two factors. The first factor a is used as the major factor in sort order. The second factor b is used as minor factor in sort order.
b.offset: amount added to position(b) to adjust appearance.
b.scale: scale to relate units of position(a) to units of position(b).
drop, sep: See factor.

Value

"positioned" object containing the ordinary interaction with a "position" attribute.

Examples

a <- positioned(letters[c(1,2,3,1,2,3)], value=c(1,4,9))
b <- positioned(LETTERS[c(4,4,4,5,5,5)], value=c(1,2))
a.b <- interaction.positioned(a, b)
a.b.2 <- interaction.positioned(a, b, b.scale=.2)
b.a <- interaction.positioned(b, a)

Documentation reproduced from package HH, version 3.1-8, License: GPL (>= 2)

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