panel.qqmathline {lattice}  R Documentation 
Useful panel function with qqmath. Draws a line passing through the points (usually) determined by the .25 and .75 quantiles of the sample and the theoretical distribution.
panel.qqmathline(x, y = x, distribution = qnorm, p = c(0.25, 0.75), qtype = 7, groups = NULL, ...)
x 
The original sample, possibly reduced to a fewer number of
quantiles, as determined by the f.value argument to
qqmath

y 
an alias for x for backwards compatibility

distribution 
quantile function for reference theoretical distribution. 
p 
numeric vector of length two, representing probabilities. Corresponding quantile pairs define the line drawn. 
qtype 
the type of quantile computation used in
quantile

groups 
optional grouping variable. If nonnull, a line will be drawn for each group. 
... 
other arguments. 
Deepayan Sarkar Deepayan.Sarkar@Rproject.org
prepanel.qqmathline
,
qqmath
,
quantile