plotMeans {Rcmdr}R Documentation

Plot Means for One or Two-Way Layout

Description

Plots cell means for a numeric variable in each category of a factor or in each combination of categories of two factors, optionally along with error bars based on cell standard errors or standard deviations.

Usage

plotMeans(response, factor1, factor2,
    error.bars = c("se", "sd", "conf.int", "none"), level=0.95,
    xlab = deparse(substitute(factor1)),
    ylab = paste("mean of", deparse(substitute(response))), 
    legend.lab = deparse(substitute(factor2)), main = "Plot of Means", 
    pch = 1:n.levs.2, lty = 1:n.levs.2, col = palette())

Arguments

response Numeric variable for which means are to be computed.
factor1 Factor defining horizontal axis of the plot.
factor2 If present, factor defining profiles of means
error.bars If "se", the default, error bars around means give plus or minus one standard error of the mean; if "sd", error bars give plus or minus one standard deviation; if "conf.int", error bars give a confidence interval around each mean; if "none", error bars are suppressed.
level level of confidence for confidence intervals; default is .95
xlab Label for horizontal axis.
ylab Label for vertical axis.
legend.lab Label for legend.
main Label for the graph.
pch Plotting characters for profiles of means.
lty Line types for profiles of means.
col Colours for profiles of means

Value

The function invisibly returns NULL.

Author(s)

John Fox jfox@mcmaster.ca

See Also

interaction.plot


[Package Rcmdr version 1.1-6 Index]