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Last data update: 2014.03.03

R: Plot Confidence or Prediction Hyperbolas around a Regression...

linesHyperb.lm

R Documentation

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

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")