plot.princmp function

plot.princmp

Plot Method for princmp

## S3 method for class 'princmp'
plot(
  x,
  which = c("scree", "loadings"),
  k = x$k,
  offset = 0.8,
  col = 1,
  adj = 0,
  ylim = NULL,
  add = FALSE,
  abbrev = 25,
  nrow = NULL,
  ...
)

Arguments

• x: results of princmp
• which: 'scree' or 'loadings'
• k: number of components to show, default is k specified to princmp
• offset: controls positioning of text labels for cumulative fraction of variance explained
• col: color of plotted text in scree plot
• adj: angle for plotting text in scree plot
• ylim: y-axis scree plotting limits, a 2-vector
• add: set to TRUE to add a line to an existing scree plot without drawing axes
• abbrev: an integer specifying the variable name length above which names are passed through [abbreviate(..., minlength=abbrev)]
• nrow: number of rows to use in plotting loadings. Defaults to the ggplot2 facet_wrap default.
• ...: unused

Returns

ggplot2 object if which='loadings'

Details

Uses base graphics to by default plot the scree plot from a [princmp()] result, showing cumultive proportion of variance explained. Alternatively the standardized PC loadings are shown in a ggplot2 bar chart.

Author(s)

Frank Harrell