ccbiplot {acca}

ccbiplot

Description

The function adapts the ggbiplot::ggbiplot() function to an acca-object.

Usage

ccbiplot(
  pcobj,
  choices = 1:2,
  scale = 1,
  pc.biplot = TRUE,
  obs.scale = 1 - scale,
  var.scale = scale,
  groups = NULL,
  shapes = NULL,
  ellipse = FALSE,
  ellipse.prob = 0.68,
  labels = NULL,
  labels.size = 3,
  alpha = 1,
  var.axes = TRUE,
  circle = FALSE,
  circle.prob = 0.69,
  varname.size = 3,
  varname.adjust = 1.5,
  varname.abbrev = FALSE,
  arrows.color = NULL,
  ...
)

Arguments

pcobj

an object returned by acca:cc()

choices

which PCs to plot

scale

covariance biplot (scale = 1), form biplot (scale = 0). When scale = 1, the inner product between the variables approximates the covariance and the distance between the points approximates the Mahalanobis distance.

pc.biplot

for compatibility with biplot.princomp()

obs.scale

scale factor to apply to observations

var.scale

scale factor to apply to variables

groups

optional factor variable indicating the groups that the observations belong to. If provided the points will be colored according to groups

shapes

which shapes to use when plotting observations

ellipse

draw a normal data ellipse for each group?

ellipse.prob

size of the ellipse in Normal probability

labels

optional vector of labels for the observations

labels.size

size of the text used for the labels

alpha

alpha transparency value for the points (0 = transparent, 1 = opaque)

var.axes

draw arrows for the variables?

circle

draw a correlation circle?

circle.prob

size of the circle in qchisq(circle.prob, df = 2)

varname.size

size of the text for variable names

varname.adjust

adjustment factor the placement of the variable names, >= 1 means farther from the arrow

varname.abbrev

whether or not to abbreviate the variable names

arrows.color

color of the arrows

...

not used yet

Value

It returns a ggplot object.