screeplot

0th

Percentile

Screeplots

screeplot.default plots the variances against the number of the principal component. This is also the plot method for classes "princomp" and "prcomp".

Keywords
multivariate
Usage
## S3 method for class 'default':
screeplot(x, npcs = min(10, length(x$sdev)),
          type = c("barplot", "lines"),
          main = deparse(substitute(x)), ...)
Arguments
x
an object containing a sdev component, such as that returned by princomp() and prcomp().
npcs
the number of components to be plotted.
type
the type of plot. Can be abbreviated.
main, ...
graphics parameters.
References

Mardia, K. V., J. T. Kent and J. M. Bibby (1979). Multivariate Analysis, London: Academic Press.

Venables, W. N. and B. D. Ripley (2002). Modern Applied Statistics with S, Springer-Verlag.

See Also

princomp and prcomp.

Aliases
  • screeplot
  • screeplot.default
Examples
library(stats) require(graphics) ## The variances of the variables in the ## USArrests data vary by orders of magnitude, so scaling is appropriate (pc.cr <- princomp(USArrests, cor = TRUE)) # inappropriate screeplot(pc.cr) fit <- princomp(covmat = Harman74.cor) screeplot(fit) screeplot(fit, npcs = 24, type = "lines")
Documentation reproduced from package stats, version 3.3, License: Part of R 3.3

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