## ----setup, include = FALSE---------------------------------------------------
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.width = 4,
  fig.height = 3.2
)

## ----model--------------------------------------------------------------------
mod <- lm(Petal.Width ~ Petal.Length * Species, data = iris)
newdat <- expand.grid(
  Petal.Length = seq(1, 7, by = 0.1),
  Species = c("setosa", "versicolor", "virginica")
)
pred <- predict(mod, newdat, interval = "confidence")
dd <- cbind(newdat, pred)

## ----panel-ci, fig.cap="Example of using panel.ci."---------------------------
library(tactile)
xyplot(fit ~ Petal.Length,
  groups = Species, data = dd,
  prepanel = prepanel.ci, auto.key = list(lines = TRUE, points = FALSE),
  ylab = "Petal Width",
  xlab = "Petal Length",
  lower = dd$lwr,
  upper = dd$upr,
  type = "l",
  panel = function(...) {
    panel.ci(..., alpha = 0.15, grid = TRUE)
    panel.xyplot(...)
  }
)

## ----qqmath, fig.cap="Example of using panel.qqmathci."-----------------------
qqmath(~ height | voice.part,
  aspect = "xy", data = singer,
  prepanel = prepanel.qqmathline,
  distribution = qnorm,
  ci = 0.9,
  panel = function(x, ...) {
    panel.qqmathci(x, ...)
    panel.qqmathline(x, ...)
    panel.qqmath(x, ...)
  }
)