Screeplot for symmetric co-correspondence analysis

Produces a screeplot of the eigenvalues of a symmetric co-correspondence analysis.

# S3 method for symcoca
screeplot(x, type = "b",
    xlab = NULL, ylab = NULL,
    ...)

Arguments

x	an object of class "symcoca", the result of a call to symcoca.
type	the type of points to draw; see points.
xlab, ylab	labels for the x and y axes. If none supplied suitable labels are formed from the result object.
...	other graphical parameters as in 'par' may also be passed as arguments.

Author

Gavin L. Simpson.

See also

coca, screeplot, plot.default

Examples

## symmetric CoCA
data(beetles)
data(plants)

## log transform the bettle data
beetles <- log(beetles + 1)

## fit the model
bp.sym <- coca(beetles ~ ., data = plants, method = "symmetric")
#> 
#> Removed some species that contained no data in: beetles, plants 

## draw a screeplot of the eignevalues
screeplot(bp.sym)