Plot a pptr model.

Visualizes a pptr model. By default, shows a mosaic overview with tree structure, decision boundaries, and variable importance. Use type to show individual plots.

Usage

# S3 method for class 'pptr'
plot(x, type = NULL, metric = NULL, node = 1L, ...)

Arguments

x

A pptr model.

type

Character string specifying the plot type. NULL (default) shows a mosaic overview. Other options: "structure" for tree with embedded histograms, "importance" for variable importance, "projection" for projected data at a node, "boundaries" for decision boundaries in feature space.

metric

Character string selecting a single importance metric to plot: "projections", "weighted", or "permuted" (availability depends on the model). NULL (default) shows all available metrics together. Only used when type = "importance".

node

Integer index of the node for projection plots (1-based, breadth-first order). Defaults to 1 (root node). Only used when type = "projection".

...

Additional arguments passed to the internal plotting function.

Value

A ggplot2-compatible object (invisibly). The mosaic layout returns a patchwork object that works with ggplot2::ggsave().

Examples

if (FALSE) { # \dontrun{
model <- pptr(Type ~ ., data = iris)
plot(model)                         # mosaic overview
plot(model, type = "structure")     # tree structure only
plot(model, type = "importance")    # variable importance
plot(model, type = "projection")   # projection histogram
plot(model, type = "boundaries")   # decision boundaries
} # }