Plot Means Interaction

Provides a plot of the confidence intervals for the simple effects and the interaction contrast in a 2x2 design.

Usage

# S3 method for data.frame
plotMeansInteraction(frame, ylab="Outcome", xlab="", mu=0, conf.level=.95, rope=NULL, values=TRUE, main=NULL, ylim=NULL, digits=3)

# S3 method for formula
plotMeansInteraction(formula, ylab="Outcome", xlab="", mu=0, conf.level=.95, rope=NULL, values=TRUE, main=NULL, ylim=NULL, digits=3)

# S3 method for bsm
plotMeansInteraction(moments, ylab="Outcome", xlab="", mu=0, conf.level=.95, rope=NULL, values=TRUE, main=NULL, ylim=NULL, digits=3)

Arguments

frame

a set of (non-empty) numeric vectors of data values

formula

a formula of the form lhs ~ rhs where lhs is a numeric variable giving the data values and rhs a factor giving the corresponding groups

moments

a matrix/frame of descriptive/summary statistics

by

a factor used for blocking

ylab

a label for the y-axis

xlab

a label for the x-axis

mu

a number indicating the true/hypothesized value of the mean difference

conf.level

confidence level of the interval

rope

lower and upper values for a region of practical equivalence

values

whether the points should be labeled with their values

main

a custom title for the graph

ylim

custom limits for the y axis

digits

the specified number of decimal places

Value

The returned plot contains the following components:

Est

the contasts for the simple effects

LL

the lower limit of the confidence intervals for the simple effects

UL

the upper limit of the confidence intervals for the simple effects

Est

the interaction contrast

LL

the lower limit of the confidence interval for the interaction contrast

UL

the upper limit of the confidence interval for the interaction contrast

mu

a horizontal line for the true/hypothesized value

rope

a shaded region of practical equivalence