interaction2wt

0th

Percentile

Plot all main effects and twoway interactions in a multifactor design

The main diagonal displays boxplots for the main effects of each factor. The off-diagonals show the interaction plots for each pair of factors. The i,j panel shows the same factors as the j,i but with the trace- and x-factor roles interchanged.

Keywords
hplot, design
Usage
interaction2wt(x, ...)

## S3 method for class 'formula':
interaction2wt(x, data = sys.parent(), responselab, ...)

## S3 method for class 'default':
interaction2wt(x,
               response.var,
               responselab = deparse(substitute(response.var)),
               responselab.expression = responselab,
               relation = list(x = "same", y = "same"),
               x.relation = relation$x,
               y.relation = relation$y,
               digits = 3,
               x.between=1,
               y.between=1,
               between,
               cex = 0.75,
               rot=c(0,0),
               panel.input = panel.interaction2wt,
               strip.input =
                if (label.as.interaction.formula) strip.default
                else strip.interaction2wt,
               par.strip.text.input = trellis.par.get()$add.text,
               scales.additional,
               main.in =
                 paste(responselab,
                       ": ", c("main", "simple")[1+simple],
                       " effects and 2-way interactions",
                       sep=""),
               xlab = "",
               ylab = "",
               simple=FALSE,
               box.ratio=if (simple) .32 else 1,
               label.as.interaction.formula=TRUE,
               ...,
               main.cex,
               key.cex.title=.8,
               key.cex.text=.7,
               factor.expressions=names.x,
               simple.pch=NULL
)
Arguments
x
The object on which method dispatch is carried out. For the "formula" method, a formula describing the response variable and factors. The formula is generally of the form y ~ g1 + g2 + .... There may be one
data
For the formula method, a data frame containing values for any variables in the formula. In the R version, if not found in data, or if data is unspecified, the variables are looked for in the env
responselab
Character name of response variable, defaults to the name of the response variable in the formula.
responselab.expression
plotmath or character name of response variable, defaults to responselab.
...
additional arguments, primarily trellis arguments.
response.var
For the "default" method, the response variable. This is usually constructed by formula method from the input data and the input formula.
simple
logical. TRUE if simple effects are to be displayed. Arguments simple.offset, simple.scale, and col.by.row may also be needed. See pan
box.ratio
#ifndef S-Plus xyplot. #endif #ifdef S-Plus bwplot. #endif
relation
trellis argument.
x.relation
x value of relation argument.
y.relation
y value of relation argument.
digits
doesn't do anything at the moment
x.between
x value of between argument.
y.between
y value of between argument.
between
trellis/lattice between argument. If used, between has precedence over both the x.between and y.between arguments.
cex
S-Plus: changes the size of the median dot in the boxplots. R: doesn't do anything.
panel.input
panel function. Default is panel.interaction2wt.
label.as.interaction.formula
logical. If TRUE, each panel has a single strip label of the form y ~ a | b. If FALSE, each panel has a pair of strip labels, one for the trace factor and one for the x factor.
strip.input
strip function. Default depends on the value of label.as.interaction.formula.
par.strip.text.input
par.strip.text argument.
scales.additional
additional arguments to scales argument of interaction.positioned.
main.in
Text of main title.
xlab
No effect.
ylab
No effect.
main.cex
cex for main title.
key.cex.title
cex key title. Defaults to cex for xlab.
key.cex.text
cex group names in key. Defaults to cex for axis.text.
factor.expressions
Expressions for titles of keys and xlab for each column. Defaults to the names of the factors in the input formula.
rot
Rotation of x tick labels and y tick labels. Only 0 and 90 will look good.
simple.pch
Named list containing plotting characters for each level of one or more of the factors. simple.pch is used only when simple==TRUE. If the argument simple.pch is missing, then the integers for the lev
Value

  • "trellis" object containing the plot.

References

Heiberger, Richard M. and Holland, Burt (anticipated 2015). Statistical Analysis and Data Display: An Intermediate Course with Examples in R, Second Edition. Springer Texts in Statistics. Springer. ISBN 978-1-4939-2121-8. Heiberger, Richard M. and Holland, Burt (2004b). Statistical Analysis and Data Display: An Intermediate Course with Examples in S-Plus, R, and SAS. Springer Texts in Statistics. Springer. ISBN 0-387-40270-5.

See Also

panel.interaction2wt

Aliases
  • interaction2wt
  • interaction2wt.formula
  • interaction2wt.default
Examples
data(vulcan)
interaction2wt(wear ~ filler + pretreat + raw, data=vulcan,
               par.strip.text=list(cex=.7))
interaction2wt(wear ~ filler + pretreat + raw, data=vulcan)
interaction2wt(wear ~ filler + raw, data=vulcan,
               simple=TRUE)
interaction2wt(wear ~ filler + raw, data=vulcan,
               simple=TRUE, simple.scale=c(filler=.15, raw=.2),
               xlim=c(.3, 5.6))

ToothGrowth$dose <- positioned(ToothGrowth$dose) ## modify local copy
anova(aov(len ~ supp*dose, data=ToothGrowth))
interaction2wt(len ~ supp + dose, data=ToothGrowth)


esoph$rate=with(esoph, ncases/ncontrols) ## modify local copy

position(esoph$alcgp) <- 2:5
position(esoph$tobgp) <- 2:5

interaction2wt(rate ~ agegp + alcgp + tobgp, esoph, rot=c(90,0),
                 par.strip.text=list(cex=.8))

interaction2wt(rate ~ agegp + alcgp + tobgp, esoph, rot=c(90,0),
               par.strip.text=list(cex=.8),
               factor.expressions=c(
                 agegp=expression(Age~~(years)),
                 alcgp=expression(Alcohol~
                   bgroup("(",scriptstyle(frac(gm, day)),")")),
                 tobgp=expression(Tobacco~
                   bgroup("(",scriptstyle(frac(gm, day)),")"))),
               par.settings=list(
                 par.xlab.text=list(cex=.8),
                 par.ylab.text=list(cex=.8)),
               responselab.expression="Cancer
Rate",
               main=list(
"Esophogeal Cancer Rate ~ Alcohol Consumption + Tobacco Consumption",
                 cex=1.2))

esoph.aov <- aov(rate ~ agegp + alcgp + tobgp, data=esoph)
anova(esoph.aov)
Documentation reproduced from package HH, version 3.1-19, License: GPL (>= 2)

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