Augmented version of qqmath — xqqmath • mosaic

Augmented version of qqmath

xqqmath(x, data = NULL, panel = "panel.xqqmath", ...)

panel.xqqmath(
  x,
  qqmathline = !(fitline || idline),
  idline = FALSE,
  fitline = NULL,
  slope = NULL,
  intercept = NULL,
  overlines = FALSE,
  groups = NULL,
  ...,
  col.line = trellis.par.get("add.line")$col,
  pch = 16,
  lwd = 2,
  lty = 2
)

Arguments

x, data, panel, ...: as in lattice::qqmath()
qqmathline: a logical: should line be displayed passing through first and third quartiles?
idline: a logical; should the line y=x be added to the plot?
fitline: a logical; should a fitted line be added to plot? Such a line will use slope and intercept if provided, else the standard deviation and mean of the data. If slope is specified, the line will be added unless fitline is FALSE.
slope: slope for added line
intercept: intercept for added line
overlines: a logical: should lines be on top of qq plot?
groups, pch, lwd, lty: as in lattice plots
col.line: color to use for added lines

Value

a trellis object

Examples

x <- rnorm(100)
xqqmath( ~ x)                  # with quartile line

xqqmath( ~ x, fitline = TRUE)  # with fitted line

xqqmath( ~ x, idline = TRUE)   # with y = x

x <- rexp(100, rate = 10)
xqqmath( ~ x, distribution = qexp)     # with quartile line

xqqmath( ~ x, distribution = qexp, slope = 1/10) 

xqqmath( ~ x, distribution = qexp, slope = mean(x))