trc: Trellis run charts for multivariate data

In qicharts: Quality Improvement Charts

Description

Run charts for multivariate data in trellis (grid) layout.

Usage

trc(
  x,
  chart = c("run", "i"),
  xscale = "same",
  yscale = "same",
  dec = NULL,
  xpad = 0.1,
  pch = 20,
  cex = 0.7,
  gap = 0.5,
  target = NA,
  ...
)

Arguments

x	Formula object to plot. The formula is of the form y ~ x | g1 + g2 + ..., indicating that plots of y (on the y-axis) versus x (on the x-axis) should be produced conditional on the variables g1, g2.
chart	Type of chart: 'run' or 'i'.
xscale	Scaling of x-axes: 'same' or 'free'.
yscale	Scaling of y-axes: 'same' or 'free'.
dec	Number of decimals of median value. The default behaviour (smart rounding to at least two significant digits) should be satisfactory in most cases.
xpad	Number specifying the fraction by which to extend the x-axis in order to make space for the median label.
pch	Plotting character.
cex	Number indicating the magnification of plotting character.
gap	Number indicating spacing between panels.
target	Value specifying a target line to plot.
...	Further arguments to xyplot.

Details

This function is a wrapper for xyplot from the lattice package. Some usefull arguments from xyplot are main, ylab, xlab, and layout.

Value

Returns an object of class "trellis".

See Also

xyplot, qic

Examples

# Trellis run chart on 1 conditioning variable
d1 <- data.frame(y = rnorm(96, 12, 3),
                 expand.grid(x = 1:24,
                             g = LETTERS[1:4]))
trc(y ~ x | g, data = d1, main = 'Trellis run chart')

# Add target line
trc(y ~ x | g, data = d1, main = 'Trellis run chart', target = 20)

# Trellis run chart on 2 conditioning variables
d2 <- data.frame(y = rnorm(144, 12, 3),
                 expand.grid(x = seq.Date(as.Date('2014-1-1'),
                                          by = 'week',
                                          length.out = 24),
                             g1 = LETTERS[1:3],
                             g2 = letters[1:2]))
trc(y ~ x | g1 + g2, data = d2, main = 'Trellis run chart')

# Introduce a shift in process performance
d2$y[132:144] <- d2$y[132:144] * 3
trc(y ~ x | g1 + g2, data = d2, main = 'Trellis run chart')

# Make I chart
trc(y ~ x | g1 + g2, data = d2, main = 'Trellis run chart', chart = 'i')

Example output

qicharts will no longer be maintained. Please consider moving to qicharts2: https://anhoej.github.io/qicharts2/.
Warning message:
trc() will be deprecated. Use tcc() instead. 
Warning message:
trc() will be deprecated. Use tcc() instead. 
Warning message:
trc() will be deprecated. Use tcc() instead. 
Warning message:
trc() will be deprecated. Use tcc() instead. 
Warning message:
trc() will be deprecated. Use tcc() instead. 

qicharts documentation built on April 20, 2021, 5:09 p.m.