HH: interaction.positioned – R documentation

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interaction.positioned

interaction method for positioned factors.

Description

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.

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.

Author(s)

Richard M. Heiberger <rmh@temple.edu>

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)

HH

Statistical Analysis and Data Display: Heiberger and Holland

v3.1-43

GPL (>= 2)

Authors

Richard M. Heiberger

Initial release

2020-11-27