psych (version 1.0-77)

error.crosses: Plot x and y error bars

Description

Given two vectors of data, plot the means and show standard errors in both X and Y directions.

Usage

error.crosses(x, y, labels = NULL, pos = NULL, arrow.len = 0.2, ...)

Arguments

x

A vector of summary statistics (from Describe)

y

A second vector of summary statistics (also from Describe)

labels

name the pair

pos

Labels are located where with respect to the mean?

arrow.len

Arrow length

...

Other parameters for plot

Details

For an example of two way error bars describing the effects of mood manipulations upon positive and negative affect, see http://personality-project.org/revelle/publications/happy-sad-appendix/FIG.A-6.pdf

The second example shows how error crosses can be done for multiple variables where the grouping variable is found dynamically.

See Also

To draw error bars for single variables error.bars, or by groups error.bars.by, or to find descriptive statistics describe or descriptive statistics by a grouping variable describe.by

Examples

desc <- describe(attitude)
x <- desc[1,]
y <- desc[2,]
plot(x$mean,y$mean,xlab=rownames(x),ylab=rownames(y))   #in graphics window
error.crosses(x,y)    #in graphics window
#now for a bit more complicated plotting 
desc <- describe.by(attitude,(attitude[,7]>41)) #select a high and low group
g1 <- desc$'FALSE'
g2 <- desc$'TRUE'
plot(g1$mean,g2$mean,xlab = "Low Advance",ylab="High Advance",xlim=c(30,80),ylim=c(50,80))
error.crosses(g1,g2,labels=rownames(g1),pos=rep(1,7))
title("Attitudes grouped by high and low scores on Advance")