File:Bland-altman plot.png

DescriptionBland-altman plot.png	English: An example of Bland-Altman disagreement plot with the same data set used by Bland and Altman in their original publication at Lancet (1996). The two extreme lines are the +2 and -2 standard deviation of the difference between two methods.
Date	2 August 2008 (upload date)
Source	Own work
Author	Dekisugi
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This plot was created by using the R statistical programming language. Here is the function:

bland_altman_plot <- function(method1,method2,
	xlab="Average", ylab="Difference")
{
	avgMean <- stack(mean(as.data.frame(t(cbind(method1,
		method2)))))$values
					
	diff <- method1 - method2
	plot(diff ~ avgMean,pch=16,ylim=c(-100,100),xlab=xlab,ylab=ylab)
	
	abline(h=mean(diff)-c(-2,0,2)*sd(diff),lty=2)
}

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