linesHyberb.lm: Plot Confidence or Prediction Hyperbolas around a Regression...

In sfsmisc: Utilities from 'Seminar fuer Statistik' ETH Zurich

Plot Confidence or Prediction Hyperbolas around a Regression Line

Description

Add confidence/prediction hyperbolas for y(x_0) to a plot with data or regression line.

Usage

linesHyperb.lm(object, c.prob=0.95, confidence=FALSE,
            k=if (confidence) Inf else 1,
            col=2, lty=2, do.abline=TRUE)

Arguments

object	result of lm(.).
c.prob	coverage probability in (0,1).
confidence	logical; if true, do (small) confidence band, else, realistic prediction band for the mean of k observations.
k	integer or Inf; assume k future observations; k = Inf corresponds to confidence intervals (for y).
col, lty	attributes for the lines to be drawn.
do.abline	logical; if true, the regression line is drawn as well.

Note

With predict.lm(*, interval=) is available, this function linesHyperb.lm is only slightly more general for its k argument.

Author(s)

Martin Maechler, Oct 1995

See Also

predict.lm(*, interval=) optionally computes prediction or confidence intervals.

Examples

data(swiss)
      plot(Fertility ~ Education, data = swiss) # the data
(lmS <- lm(Fertility ~ Education, data = swiss))
linesHyperb.lm(lmS)
linesHyperb.lm(lmS, conf=TRUE, col="blue")

sfsmisc documentation built on Sept. 11, 2024, 6:53 p.m.