Shift Plot Between Two Sets of Data
A shift plot is a plot of the quantiles of a data set y minus those of another data set x against those of x. Includes 95 percent simultaneous confidence bands.
shiftplot(x, y, pch = 20, xlab = "x Quantiles", ylab = "y Quantiles", main = NULL, ...)
x |
numeric vector of length m. |
y |
numeric vector of length n. |
pch |
Plotting character. |
xlab |
Character string giving abscissa axis label. |
ylab |
Character string giving ordinate axis label. |
main |
Character string giving plot title. |
... |
Other optional arguments to plot function. |
The shift plot is a graph of y_q - x_q vs. x_q, where y_q and x_q denote the quantiles of x and y, resp. 95 percent simultaneous confidence bands are calculated per Doksum and Sievers (1976). The primary usage of this plot is where x is a control group and y is an experimental method; or something similar. For example, x might represent observations, and y might represent climate model output; or some such.
No value is returned, but a plot is created.
Peter Guttorp
Doksum, K. A. and Sievers, G. L. (1976) Plotting with confidence: graphical comparisons of two populations. Biometrika, 63, (3), 421–434.
z <- rnorm( 100) y <- rexp(30) shiftplot( z, y) data( ftcanmax) shiftplot( y, ftcanmax[,"Prec"])
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