xqqmath: Augmented version of `qqmath`

Description

Augmented version of qqmath

Usage

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
)

Value

a trellis object

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

Examples

Run this code

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))

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