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# Bland-Altman plot R function. | |
# Author: jmmateos@mce.hggm.es | |
baplot <- function(m1, m2, ...) { | |
# m1 and m2 are the measurements | |
means <- (m1 + m2) / 2 | |
diffs <- m1 - m2 | |
mdiff <- mean(diffs) | |
sddiff <- sd(diffs) | |
# Compute the figure limits | |
ylimh <- mdiff + 3 * sddiff | |
yliml <- mdiff - 3 * sddiff | |
# Plot data | |
plot(diffs ~ means, xlab = "Average values", | |
ylab = "Differences", ylim = c(yliml, ylimh), ...) | |
abline(h = mdiff) # Center line | |
# Standard deviations lines | |
abline(h = mdiff + 1.96 * sddiff, lty = 2) | |
abline(h = mdiff - 1.96 * sddiff, lty = 2) | |
} |
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