plot.ppr: Plot Ridge Functions for Projection Pursuit Regression Fit

Description Usage Arguments Value Side Effects See Also Examples

Description

Plot the ridge functions for a projection pursuit regression (ppr) fit.

Usage

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## S3 method for class 'ppr'
plot(x, ask, type = "o", cex = 1/2,
     main = quote(bquote(
         "term"[.(i)]*":" ~~ hat(beta[.(i)]) == .(bet.i))),
     xlab = quote(bquote(bold(alpha)[.(i)]^T * bold(x))),
     ylab = "", ...)

Arguments

x

an R object of class "ppr" as produced by a call to ppr.

ask

the graphics parameter ask: see par for details. If set to TRUE will ask between the plot of each cross-section.

type

the type of line (see plot.default) to draw.

cex

plot symbol expansion factor (relative to par("cex")).

main, xlab, ylab

axis annotations, see also title. Can be an expression (depending on i and bet.i), as by default which will be eval()uated.

...

further graphical parameters, passed to plot().

Value

None

Side Effects

A series of plots are drawn on the current graphical device, one for each term in the fit.

See Also

ppr, par

Examples

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require(graphics)

rock1 <- within(rock, { area1 <- area/10000; peri1 <- peri/10000 })
par(mfrow = c(3,2)) # maybe: , pty = "s")
rock.ppr <- ppr(log(perm) ~ area1 + peri1 + shape,
                data = rock1, nterms = 2, max.terms = 5)
plot(rock.ppr, main = "ppr(log(perm)~ ., nterms=2, max.terms=5)")
plot(update(rock.ppr, bass = 5), main = "update(..., bass = 5)")
plot(update(rock.ppr, sm.method = "gcv", gcvpen = 2),
     main = "update(..., sm.method=\"gcv\", gcvpen=2)")