qq {lattice} | R Documentation |
Quantile-Quantile plots for comparing two Distributions
qq(formula, f.value = ppoints, ...)
formula |
formula of the form y ~ x | g1 * g2 * ... ,
where x must be a numeric, and y can be a factor,
shingle, character or numeric vector, with the restriction that there
must be exactly two levels of y , which divide the values of
x into two groups. Quantiles for these groups will be plotted
along the two axes.
|
f.value |
function of a single integer (representing sample size), returning a vector of probabilities corresponding to which quantiles should be plotted. |
... |
Other arguments |
These and all other high level Trellis functions have several
arguments in common. These are extensively documented only in the
help page for xyplot
, which should be consulted to learn more
detailed usage.
An object of class ``trellis''. The `update' method can be used to update components of the object and the `print' method (usually called by default) will plot it on an appropriate plotting device.
Deepayan Sarkar deepayan@stat.wisc.edu
data(singer) qq(voice.part ~ height, aspect = 1, data = singer, subset = (voice.part == "Bass 2" | voice.part == "Tenor 1"))